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10. Igneous rock sample l-4. What is the name of this rock?

10. Igneous rock sample l-4. What is the name of this rock?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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Igneous Rock Identification Now that we have some of the basics down, we can start putting names to our igneous rocks. Below you will see a classification chart for some of the most common igneous rocks. You will use this chart to identify some mystery rocks. Igneous rocks are classified based on composition (columns) and texture (rows). For example, an igneous rock that is mafic in composition with a fine-grained aphanitic texture would be called a basalt. Quartz Muscovite K-Feldspar Na rich Plagioclase Ca rich Minerals Present in Igneous Rock Biotite Amphibole Pyroxene Olivine Composition of Rock Felsic Intermediate Mafic Ultramafic Texture Name of Rock Phaneritic Granite Diorite Gabbro Peridotite Porphyritic rhyolite Porphyritic Porphyritic Porphyritic Rocks in this area of texture andesite basalt and composition are either non- existent or toO rare to consider at the introductory level. Aphanitic Rhyolite Andesite Basalt Glassy Obsidian Vesicular Pumice Scoria Pyroclastic Ash, tuff, volcanic breccia 10. Igneous rock sample l-4. What is the name of this rock? Classification Extrusive Intrusive
Transcribed Image Text:Igneous Rock Identification Now that we have some of the basics down, we can start putting names to our igneous rocks. Below you will see a classification chart for some of the most common igneous rocks. You will use this chart to identify some mystery rocks. Igneous rocks are classified based on composition (columns) and texture (rows). For example, an igneous rock that is mafic in composition with a fine-grained aphanitic texture would be called a basalt. Quartz Muscovite K-Feldspar Na rich Plagioclase Ca rich Minerals Present in Igneous Rock Biotite Amphibole Pyroxene Olivine Composition of Rock Felsic Intermediate Mafic Ultramafic Texture Name of Rock Phaneritic Granite Diorite Gabbro Peridotite Porphyritic rhyolite Porphyritic Porphyritic Porphyritic Rocks in this area of texture andesite basalt and composition are either non- existent or toO rare to consider at the introductory level. Aphanitic Rhyolite Andesite Basalt Glassy Obsidian Vesicular Pumice Scoria Pyroclastic Ash, tuff, volcanic breccia 10. Igneous rock sample l-4. What is the name of this rock? Classification Extrusive Intrusive
7. Which rocks formed under slow cooling Vs. conditions? Check all that apply. Vs. 8. Where do you think molten rocks cool faster? Explain why you chose this answer. 9. The texture of an igneous rock relates to the size of the minerals within the rock. The table below summarizes some of the key textures that you will find in igneous rocks. So far, we have seen rocks with aphanitic, phaneritic and glassy textures. Igneous rocks can also be pyroclastic or have a vesicular texture. Rocks with a vesicular texture have holes in them that were once gas bubbles in lava. The term pyroclastic refers to material that has been ejected from a volcano during an explosive eruption. The texture of the rock gives clues to the location of formation of the rock. Extrusive rocks form above the surface and Intrusive rocks form below the surface. The last column has been left mostly blank. Fill in the remaining cells. Description Texture Location of Formation (Extrusive or Intrusive) Very small minerals (can't be seen with the naked eye) Aphanitic Contains larger minerals of a similar size (can be seen with the naked eye) Mixed size (small and large) Phaneritic Porphyritic Below, and later at Earth's surface (intrusive and later extrusive) No individually visible crystals Glassy Very small and contains gas bubbles Vesicular Contains ash fragments rather than minerals Pyroclastic
Transcribed Image Text:7. Which rocks formed under slow cooling Vs. conditions? Check all that apply. Vs. 8. Where do you think molten rocks cool faster? Explain why you chose this answer. 9. The texture of an igneous rock relates to the size of the minerals within the rock. The table below summarizes some of the key textures that you will find in igneous rocks. So far, we have seen rocks with aphanitic, phaneritic and glassy textures. Igneous rocks can also be pyroclastic or have a vesicular texture. Rocks with a vesicular texture have holes in them that were once gas bubbles in lava. The term pyroclastic refers to material that has been ejected from a volcano during an explosive eruption. The texture of the rock gives clues to the location of formation of the rock. Extrusive rocks form above the surface and Intrusive rocks form below the surface. The last column has been left mostly blank. Fill in the remaining cells. Description Texture Location of Formation (Extrusive or Intrusive) Very small minerals (can't be seen with the naked eye) Aphanitic Contains larger minerals of a similar size (can be seen with the naked eye) Mixed size (small and large) Phaneritic Porphyritic Below, and later at Earth's surface (intrusive and later extrusive) No individually visible crystals Glassy Very small and contains gas bubbles Vesicular Contains ash fragments rather than minerals Pyroclastic
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