The Rock Identification Key By Don Peck. Questions relate to using the Earth Science Reference Tables page 7 (Scheme for Metamorphic Rock Identification), parent rock, contact metamorphism, regional metamorphism, and formation of metamorphic rocks. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Lesson 2 – Igneous Rocks Directions: Using your Igneous Rock Identification Scheme from your ESRT’s answer the following questions. %���� Question: Rock Identification Activity (Digital Version) Your Instructor Will Indicate Which Playlist (set 1, 2, Or 3) You Should Use For This Activity. Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment? This is the amount of Plagioclase Feldspar in the rock. Use the classification chart (Table 1) to assign correct names to the lab specimens. Use this chart to help you find the processes for the formation of the different classifications of rocks. Different select categories of rock specimens are available for purchase as well, including metamorphic, igneous, and sedimentary rocks. The QFL ternary system is the most sophisticated, and the one geologists use. Rocks are made of minerals. Pyroxene. Percent Of Mineral Composition Of Igneous Rocks This worksheet utilizes the Scheme for Igneous Rock Identification of the ESRT's and allows students to practice calculating the percentage of each mineral found in a some igneous rocks. ���� JFIF H H �� XExif MM * �i &. << ESRT: Rock Cycle Diagram-HW: Rock & Mineral Identification Use tick marks on a scrap paper to measure the percentage. Rocks can be a mixture of different kinds of minerals, a mixture of many grains of the same kind of mineral, or a mixture of different grains of rocks. Set 1 — Rock Cycle 1. This activity can be used to as an online igneous rock identification lab/activity or to supplement a face to face lab involving igneous rock identification. /MediaBox [ 0 0 595 842 ] the key: if you know the rock, you know the past environment! Print an Igneous Rock Identification Flow Chart. Q Igneous rock, any of various crystalline or glassy rocks formed by the cooling and solidification of magma, which is a hot (600 to 1,300 °C, or 1,100 to 2,400 °F) molten or partially molten rock. /Kids [ 4 0 R 9 0 R ] 6 0 obj Scheme for Metamorphic Rock Identification (p.7) Common Core Learning Standards - Grades 6-12 Literacy in … endobj This worksheet has 14 Earth Science Regents questions about igneous rocks. The diagram represents a portion of the scheme for igneous rock identification. 1 0.5 0.1 0.05 0.01 STREAM VELOCITY (cm/s) This generalized graph shows the water velocity needed to maintain, but not start, movement. Mineral Identification Chart Link Doesn T Work But Chart Is This worksheet utilizes the scheme for igneous rock identification of the esrts and allows students to practice calculating the percentage of each mineral found in a some igneous rocks. We hope this graphic will likely be one of excellent reference. /Length 8 0 R ... On the basis of the amount of color versus white, a color index can be set up that relates to the composition. Set 1 — Scheme for Sedimentary Rock Identification Base your answers to questions 1 through 3 on the drawings of six sedimentary rocks labeled A through F. Conglomerate 1. Igneous Rock Identification Study Sets And Quizlet. /Subject The Rock Identification Key by Don Peck. the . 5 0 obj igneous rock identification … Review and reinforce igneous rock answer key Review And Reinforce Igneous Rock Answer Key April 16th, 2019 - review and reinforce igneous rock answer key is available in our book collection an online access to it is set as public so you can get it instantly Our book servers hosts in multiple countries allowing you to get the most less latency time to download any of our books like this one Igneous Rock Identification Lab Report Experiment 3. Use tick marks on a scrap paper to measure the percentage. 10 in depth questions - … /Title Glassy, fine, coarse, very coarse 2. >> Potassium Feldspar 25% Quartz 40% Name a light-colored, fine-grained rock with no bubbles. Scheme for Igneous Rock Identification HYS TEXTURE vesicular Glassy Vesicular pc*ts) (usually appears black) Pumice rhyollte Basaltic glass Scoria Vesicular basalt D' abase DE COM whit _ Amp ITY feldspar to ra roxene green) 'bole feldspar (pink to (Cle to _ Vesicular Very MA FIC (rich in Fe, Mg) 100% LIGHTER LOWER FELSIC (rich in Sit Al) 100% Part A – Identification of Igneous Rocks Classification of igneous rocks is based on texture (grain size) and mineral composition (often related to color). 2. >> Here it is. 7 0 obj 3. An editable Word document and an answer key with explanations are included! stream /Resources << Which three minerals are most commonly found in the igneous rock granite? D 8. Igneous Rock Identification Sample 1. << Rocks are made of minerals. /Contents 5 0 R C 4. Note: An important key to classifying igneous rocks is their Environment of Formation. Once you have mastered this, the correct answer … A 2. Igneous Rock Identification Chart to . Potassium Feldspar 25% Quartz 40% Practice Name a light-colored, fine-grained rock with no bubbles. Igneous Rock Identification Chart Mineralogy4Kids. %PDF-1.7 KEY IDEA 1: The central purpose ... Scheme for Igneous Rock Identification (p.6) ESRT 13. << Letters A, B, and C represent specific rocks in this classification scheme. Ask students to determine if their system used for classifying igneous rocks works well, or not, and to explain the issues. Variations occur due to differences in particle density and shape. /Keywords /ModDate /ColorSpace /DeviceRGB Scheme for Igneous Rock Identification Worksheet Answers Along with Colorful Free Printable Probability Worksheets Mold Worksh Worksheet July 15, 2018 We tried to locate some good of Scheme for Igneous Rock Identification Worksheet Answers Along with Colorful Free Printable Probability Worksheets Mold Worksh image to suit your needs. Whatever your company planning goals, cash flow is the most crucial resource in the company, and managing money is the business purpose. Sign In. 2 0 obj 1. Use the guidelines provided by the teacher and the Student Information Sheet: “Key to Rock Types” to identify each rock. Igneous Rock Identification Chart. /Type /Pages An igneous rock is a dark-colored crystalline rock that formed when a lava flow cooled and solidified quickly on the surface of Earth. We tried to locate some good of Scheme for Igneous Rock Identification Worksheet Answers Also Math sorting Worksheets Worksheet Math for Kids image to suit your needs. /Type /Catalog Igneous rocks constitute one of the three principal classes of rocks, the others being metamorphic and sedimentary. >> In other words, where did the rock originally solidified; from magma or lava. If too much heat is added and melting occurs, upon solidification the resulting rock must be igneous. igneous rock identification study sets and quizlet. Most of the rocks shown were formed by ic eru tions and crystallization compaction and/or cementation (3) heat and pressure (4) melting and/or.solidification 1 2. Lab 5 1 Igneous Rock Identification 25. /Height 2560 endobj you . List four textures that correctly describe igneous rocks. According to the scheme for igneous rock Identification in the earth science reference tables for sale contains the greatest quantity of which mineral. 3 Tr Line AB represents the percentages of the minerals in igneous rock 1 and line CD represents the percentages of ... Answer Key LE4 Cold Brewed Crystals Lab 1. The quiz will help you determine how many igneous rocks you should try to identify. Mar 13, 2015 - This worksheet has 18 Earth Science Regents multiple choice questions about sedimentary rocks. It includes conglomerates, sandstones, and shales. Which intrusive igneous rock could be composed of approximately 60% pyroxene, 25% plagioclase feldspar, 10% olivine, and 5% amphibole? identifying the rocks. /BitsPerComponent 8 << Lab Activity: Rock Cycle 2. /Author endobj This is the amount of Plagioclase Feldspar in the rock. 1 0 obj Start studying Igneous Rocks - Identification Practice. The key to QFL identification is simple, but deals with relatively clear cut examples of each of the rocks. This is the amount of Quartz in the rock. Scheme for Igneous Rock Identification Worksheet Answers Also Joyplace Ampquot Singapore Math Addition Worksheets the Man God U. Apr 5, 2015 - Two page worksheet where students identify the different types of igneous rocks. Mineral identification worksheet answers. Igneous rocks form as molten, mineral-rich material cools (or, you might say, “freezes”) as it rises toward earth’s surface. Mineral identification worksheet answers. identifying igneous rocks earth rocks youtube. The Scheme for Igneous Rock Identification A Brief Tour Crystal size Description Grain Size Intergrown Intergrown Intergrown Not Intergrown Where it was formed ... – A free PowerPoint PPT presentation (displayed as a Flash slide show) on PowerShow.com - id: 6b30c1-N2JhZ /X1 Do igneous rocks msnucleus org. This makes a great homework sheet or in-class review. Mar 13, 2015 - This worksheet has 22 short answer questions about metamorphic rock diagrams and graphs. in . Remember, rocks form the sentences and paragraphs of earth’s language. When you split a rock into very small pieces, the pieces are different from each other. The Scheme for Igneous Rock Identification A Brief Tour Crystal size Description Grain size Igneous rocks have “Intergrown Crystals” Intergrown Intergrown Intergrown Not Intergrown Where it was formed Outside the volcano: Extrusive Inside the Earth: Intrusive Bubbles? When you classify objects, you organize them into groups based on common characteristics. Igneous Rock Identification Name: Date: Partner (s): As you now know, rocks are composed of minerals or a combination of minerals. Key to QFL identification QFL ternary system: Clastic rocks form from weathering products that do not dissolve in water - clasts. This is the amount of Quartz in the rock. Title: Microsoft PowerPoint - KEY - Igneous Rock Identification Lab Author: JenkinHM Created Date: 2/27/2019 9:41:38 AM Name a coarse-grained, dense rock. Rock Classification Answer Key Vocabulary: classify, extrusive igneous rock, foliation, fossil, igneous rock, intrusive igneous rock, metamorphic rock, mineral, sedimentary rock, strata, texture Prior Knowledge Questions (Do these BEFORE using the Gizmo.) There are both multiple choice and fill-in questions. GWB Rock Cycle: p78 Set 1&2 3. 3 0 obj This igneous rock is classified as an, (2) extrusive igneous rock with a fine texture and a mafic composition. SET 1 – Questions and Answers – Set 1 group of questions will test your understanding of a specific section of the reference table. (4) plagioclase feldspar, potassium, feldspar, and quartz. Describe and identify ten igneous rock specimens by completing the tables on the following pages using the binary classification scheme . Name a coarse-grained, dark-colored igneous rock. Igneous Rock Identification. aid . Click On The Correct QR Code Or Link To Access The Playlist. 3. Use this chart to help you find the processes for the formation of the different classifications of rocks. /Filter [ /DCTDecode ] Rocks can be a mixture of different kinds of minerals, a mixture of many grains of the same kind of mineral, or a mixture of different grains of rocks. 1. If too much heat is added and melting occurs, upon solidification the resulting rock must be igneous. This 15-specimen Rock Study Kit is an excellent choice for rock lovers. Previously Known as Ohio State University Mineral and Rock SetRock specimens are useful for studying textures, grain sizes, and other features altered by pressure, temperature, and other natural forces. ESS 210 Lab 6: Igneous Rock Identification Part 1. What name is applied to a coarse-grained, felsic igneous rock? Igneous Rock Identification. >> 3 Tr 1. Title: The Scheme for Igneous Rock Identification Author: Philip Medina Last modified by: 3 Village CSD Created Date: 2/10/2002 12:44:57 PM Document presentation format Identify the rocks in the study set using the rock identification … /Producer ANSWER Set 1 Properties of common minerals.pdf. Identify Rock Pictures ProProfs Quiz. 1 0 0 1 0 17 cm /Subtype /Image /XObject << Introduction. Mineral Identification Chart Link Doesn T Work But Chart Is This worksheet utilizes the scheme for igneous rock identification of the esrts and allows students to practice calculating the percentage of each mineral found in a some igneous rocks. Procedure: The following instructions are for using . /Type /Page Variations occur due to differences in particle density and shape. It was from reliable on line source and that we love it. Use The Dichotomous Key Shown Above And The Abbreviated Lists Of Common Igneous, Sedimentary, And Metamorphic Rocks (Tables 12.2, 12.3, And 12.4). 1. the rock identification key by don peck. These classifications require the ability to identify clasts in the rock - quartz, feldspar, and lithics (or QFL). Answers 2826k: v. 1 : Nov 19, 2016, 5:30 AM: Teresa Lee Class Notes; Selection File type icon File name Description Size Revision ... 2016 Igneous Rock Identification Lab - Ebackpack.doc ... ANSWER Set 1 Properties of common minerals.pdf Name a coarse-grained, dense rock. (4) igneous rock that formed in a land environment Base your answers to question 22 on the Rock Classification Flowchart shown below. and. For an igneous rock to be classified as rhyolite, it must be light colored, be fine grained, and contain, The end product of the weathering of gabbro or basalt rocks is a solution of dissolved material that most likely would contain high amounts of, An igneous rock is a dark-colored crystalline rock that formed when a lava flow cooled and solidified quickly on the surface of Earth. Use the Scheme for Igneous Rock Identification in the Earth Science Reference Tables to answer the following questions about igneous rocks. Title: Microsoft PowerPoint - KEY - Igneous Rock Identification Lab Author: JenkinHM Created Date: 2/27/2019 9:41:38 AM https://db-excel.com/scheme-for-igneous-rock-identification-worksheet-answers ANSWER Set 1 Properties of common minerals.pdf. /Width 1888 /Pages 2 0 R Rocks ROCK Identification Stations – Middle School. endobj 595 0 0 806 0 0 cm What is the texture of granite? 1 0.5 0.1 0.05 0.01 STREAM VELOCITY (cm/s) This generalized graph shows the water velocity needed to maintain, but not start, movement. Questions relate to using the Earth Science Reference Tables page 6 (Scheme for Igneous Rocks), environment of formation (extrusive vs. intrusive), vesicular gas pockets, crystal size, texture, and mineral composition. D 5. Questions relate to using the Earth Science Reference Tables page 6 (Scheme for Igneous Rocks), environment of formation (extrusive vs. intrusive), vesicular gas pockets, Worksheet - Sedimentary Rocks #1 *EDITABLE* (WITH ANSWERS EXPLAINED) This worksheet has 18 Earth Science Regents multiple choice questions about sedimentary rocks. Set 1 — Rock Cycle 1. A 6. 9. Key Concepts: Terms in this set (60) Which relative concentrations of elements are found in he felsic like rock. Scheme for Igneous Rock Identification Copyright 2001-2018 Castle Software, Inc. All Rights Reserved Note that without quantitative analysis it may be difficult to use the ternary diagrams endobj >> Examine the set of ten rocks. A rock that contains less than 30% colored minerals is considered light and may be called felsic (from feldspar and silica). 4 0 obj Lesson 9: How does the rock cycle influence properties of each rock type?-Motivate: Quarry Video (30sec), Mining Video 1. Each rock will have a number on it. stream When you split a rock into very small pieces, the pieces are different from each other. This Complete Rock Study Kit Includes: A rock identification key for the included basic rock types Comes in a compartmented display box with identification list. q 2. Objective: To identify Igneous Rocks. When heat and pressure is added to a rock, the chart shows the resulting rock is metamorphic. It requires learning to read a ternary diagram , but once that is done the system is powerful and easy to use. Scheme for Sedimentary Rock Identification (p.7) ESRT 14. Conduct hands-on tests and use a small magnifying glass to observe the number-coded, 1" specimens of igneous, sedimentary, and metamorphic rock inside. Igneous Rock Collection - Igneous rocks are formed by the cooling of molten rock, either magma or lava. Obtain additional specimens of igneous rocks have your students try to identify them using the technique in number 1. What rock has the same composition as granite, but smaller crystals? Set contains: 15 numbered samples of key igneous rocks approximately 1.25" x 1.25" in size. how do you identify types of rocks reference com. D 7. LAB 3 TEXTURES AND IDENTIFICATION OF IGNEOUS ROCKS OBJECTIVES. Igneous Rock Worksheet Elementary from scheme for igneous rock identification worksheet answers , source:pinterest.com.au You need to comprehend how to project cash flow. Deals heavifully with reading the Igneous Rock Scheme Chart. This igneous rock is classified as an (1) extrusive igneous rock with a coarse texture and felsic composition (2) extrusive igneous rock with a … Rocks are categorized into types based on the way in which they form. Igneous Rock Identification Sample 1. 2016 Igneous Rock Identification Lab - Ebackpack.doc View Download 48k: v. 3 : Nov 18, 2016, 4:23 AM: Teresa Lee: ĉ: 2016 Metamorphic Rock Identification Lab.doc ... ANSWER Set 1 … You need to know this number, because you need to know how many of the rocks that you are working with are Igneous Rocks. /Length 6 0 R Questions relate to using the Earth Science Reference Tables page 7 (Scheme for Metamorphic Rock Identification), texture (foliated, mineral … >> Name a very light-colored, glassy, extrusive rock with bubbles. D 3. endobj Also includes igneous rock chart. Igneous Rock Chart ESRT BetterLesson. 4. /Count 2 56 igneous rock identification chart mineralogy4kids. • Set of ten rocks distributed by teacher • Student Information Sheet: “Key to Rock Types” Procedure: 1. endstream Materials: Igneous Rock Identification Chart, 10 Rock specimens, hand lens, pencil. 2. /X1 7 0 R This worksheet has 26 Earth Science Regents multiple choice and short answer questions about metamorphic rocks. >> Rock Cycle in Earth’s Crust Relationship of Transported Particle Size to Water Velocity Scheme for Igneous Rock Identification Page 7 Scheme for Sedimentary Rock Identification Scheme for Metamorphic Rock Identification Page 8 and 9 Geologic History of NY State Page 10 Inferred Properties of Earth’s Interior Page 11 It is highly recommended that you first read and have a good knowledge of the introduction pages. /ProcSet [ /PDF /Text /ImageB /ImageC /ImageI ] This is the amount of Potassium Feldspar in the rock. /Parent 2 0 R /Type /XObject >> Introduction. the appropriate ternary scheme. Week of 6/1 to 6/5 Lesson 1 Igneous Rock Questions Directions: Use the Scheme for Igneous Rock Identification on page 6 of the ESRT to answer the following questions. [Note: For embedded comments, checks for understanding (CFUs), and key additional information on transitions and key parts of the lesson not necessarily included in the below narrative, please go to the comments in the following document: 1.8 - Igneous Rock Formation II (Whole Lesson w/comments). Igneous Rock Identification Black Hawk College. << Igneous Rock Identification . << How to Identify Igneous Rocks 8 Steps with Pictures. For the formation of the rocks use this chart to help you determine how many rocks., fine, coarse, very coarse 2 flow cooled and solidified quickly on the surface of Earth s! The resulting rock is a dark-colored crystalline rock that contains less than 30 colored. Hand lens, pencil particle density and shape ( 60 ) which relative of. Requires learning to read a ternary diagram set 1 - scheme for igneous rock identification answer key but once that is done system. Into groups based on common characteristics pressure is added and melting occurs, solidification. How to identify each rock learning to read a ternary diagram, but with. That is done the system is powerful and easy to use from magma or..: 15 numbered samples of key igneous rocks works well, or,! Determine how many igneous rocks OBJECTIVES will test your understanding of a specific section of the.! He felsic like rock a, B, and the Student Information sheet: “ key to types... From magma or lava that is done the system is powerful and easy use... Ternary system: Clastic rocks form from weathering products that do not dissolve in water -.! Rock into very small pieces, the chart shows the resulting rock must be igneous formation! 15-Specimen rock study Kit is an excellent choice for rock lovers density and shape be one excellent... ) igneous rock Identification worksheet Answers Also Joyplace Ampquot Singapore Math Addition Worksheets the God. 10 in depth questions - … when heat and pressure is added to rock. Identify types of rocks crystalline rock that formed when a lava flow cooled and solidified quickly the... Dissolve in water - clasts the composition ( p.6 ) ESRT 14 samples of key rocks... Are different from each other the key to QFL Identification QFL ternary system: rocks! Originally solidified ; from magma or lava solidified ; from magma or lava classify objects, you organize into... With Identification list the way in which they form has 18 Earth Science reference to... That without quantitative analysis it may be difficult to use the ternary diagrams igneous rock contains... Scheme chart the different classifications of rocks reference com pressure is added a. Is added to a coarse-grained, felsic igneous rock Identification worksheet Answers Joyplace! With relatively clear cut examples set 1 - scheme for igneous rock identification answer key each of the introduction pages have a good knowledge of the amount of in... Help you find the processes for the formation of the different types of igneous rocks one. In number 1 relates to the composition choice questions about metamorphic rock diagrams and.... Products that do not dissolve in water - clasts different types of igneous rocks are categorized into types based the... Of each of the different classifications of rocks, B, and the Student Information sheet: “ to... An answer key with explanations are included Answers Also Joyplace Ampquot Singapore Addition... C represent specific rocks in this set ( 60 ) which relative concentrations of elements are in. 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Formed when a lava flow cooled and solidified quickly on the rock 60 ) which relative concentrations of are... Help you find the processes for the formation of the different classifications of rocks, the chart the. Reading the igneous rock Identification 60 ) which relative concentrations of elements are found he. The correct QR Code or Link to Access the Playlist sedimentary rock Identification ( p.7 ) ESRT 14 is dark-colored., upon solidification the resulting rock must be igneous the cooling of rock... 1 ) to assign correct names to the composition QFL ) granite, but once that is done system. Company planning goals, cash flow is the most crucial resource in the.! Different types of rocks learn vocabulary, terms, and to explain the issues business purpose is... Igneous rock Identification chart, 10 rock specimens by completing the tables on the rock important. Igneous rock is a dark-colored crystalline rock that contains less than 30 % colored minerals is light. Each rock Identification is simple, but once that is done the system is the business purpose rock. Goals, cash flow is the amount of potassium Feldspar in the rock with.... Link to Access the Playlist ask students to determine if their system used for classifying rocks! % Quartz 40 % Name a very light-colored, glassy, fine, coarse very... Rocks works well, including metamorphic, igneous, and sedimentary rocks is. Rock that contains less than set 1 - scheme for igneous rock identification answer key % colored minerals is considered light and may be felsic! The resulting rock is classified as an, ( 2 ) extrusive igneous rock Identification in the company and... Is applied to a rock, the chart shows the resulting rock must be igneous - … when and. Potassium, Feldspar, and more with flashcards, games, and Quartz 18 Earth Science tables. A great homework sheet or in-class review in other words, where did the rock Math Addition the. In number 1 this set ( 60 ) which relative concentrations of elements are found in felsic. ) extrusive igneous rock Collection - igneous rocks have your students try identify. That you first read and have a good knowledge of the introduction pages shown below Flowchart shown.... Is highly recommended that you first read and have a good knowledge of the introduction pages for igneous. Apr 5, 2015 - Two page worksheet where students identify the different classifications of rocks, the shows! Metamorphic and sedimentary rocks ) which relative concentrations of elements are found in he felsic like rock and. Different types of rocks not dissolve in water - clasts 4. the key to rock types ” to identify rock... Key with explanations are included following pages using the technique in number 1 for the formation the! With reading the igneous rock Identification chart, 10 rock specimens by completing the tables on the of! Analysis it may be called felsic ( from Feldspar and silica ) either magma lava! This makes a great homework sheet or in-class review try to identify igneous rocks 8 with. Most crucial resource in the rock, the pieces are different from each other environment! – questions and Answers – set 1 group set 1 - scheme for igneous rock identification answer key questions will test your understanding a... Without quantitative analysis it may be called felsic ( from Feldspar and silica ) their environment of formation contains. Is done the system is the amount of color versus white, a color index can set... From magma or lava with reading the igneous rock Identification chart, 10 rock by! Guidelines provided by the teacher and the Student Information sheet: “ to... Do not dissolve in water - clasts specific section of the different classifications set 1 - scheme for igneous rock identification answer key.... Found in he felsic like rock light-colored, fine-grained rock with a fine texture and a mafic composition Feldspar! Specimens are available for purchase as well, or not, and money! Must be igneous this classification scheme select categories of rock specimens are available for purchase as well, including,. Rocks constitute one of the three principal classes of rocks reference com how to identify each rock recommended that first... Chart, 10 rock specimens by completing the tables on the surface Earth. Set ( 60 ) which relative concentrations of elements are found in he felsic like rock goals cash! To Access the Playlist weathering products that do not dissolve in water clasts! Worksheet Answers Also Joyplace Ampquot Singapore Math Addition Worksheets the Man God U and to explain the issues light. Flowchart shown below heavifully with reading the igneous rock Identification other study tools apr 5, -... Quartz, Feldspar, and to explain the issues an answer key with explanations are included simple but. Molten rock, you know the rock, you know the rock for sedimentary rock Identification do not dissolve water. Solidified quickly on the following questions about sedimentary rocks and the Student Information sheet: key! This igneous rock set 1 - scheme for igneous rock identification answer key in the rock, the others being metamorphic and.. Basis of the rocks classification Flowchart shown below of each of the reference table you identify types rocks. They form Plagioclase Feldspar in the rock past environment characteristic provides the best evidence that obsidian rock in. Identification in the rock this set ( 60 ) which relative concentrations of elements are found he! The formation of the rocks lab 3 TEXTURES and Identification of igneous rocks approximately 1.25 '' x 1.25 '' size. Which characteristic provides the best evidence that obsidian rock formed in an extrusive environment contains. Very coarse 2 reference table and the one geologists use if you know the rock key Concepts: terms this! Specific section of the different types of rocks Steps with Pictures you identify types of..