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Lab: Igneous Rock Identification Igneous Rocks are Earth materials made from the cooling and/or crystallization of molten rock. Igneous Rocks are not classified solely on their chemical composition (as were minerals), but rather, they are classified based on the existence and/or size of the crystals which comprise them. If magma cools underground, then intrusive (plutonic) rocks form. Their crystals will be large (that is, you can see them with the naked eye.) Intrusive textures include: ● ● Phaneritic: Pegmatitic: If lava cools at the surface, then extrusive (volcanic) rocks form. Their crystals will appear small or nonexistent. You may need a microscope to view these crystals. Extrusive textures include: Aphanitic: ● Glass: Porphyritic:_ In addition to crystal size, we can also try to group igneous rocks based on their metal: silica ratio. For each of the following terms, list some minerals that fit those categories. Ultramafic: Mafic: Intermediate:__ Felsic: Porphyritic Andesite Granite Pegmatite

Lab: Igneous Rock Identification Igneous Rocks are Earth materials made from the cooling and/or crystallization of molten rock. Igneous Rocks are not classified solely on their chemical composition (as were minerals), but rather, they are classified based on the existence and/or size of the crystals which comprise them. If magma cools underground, then intrusive (plutonic) rocks form. Their crystals will be large (that is, you can see them with the naked eye.) Intrusive textures include: ● ● Phaneritic: Pegmatitic: If lava cools at the surface, then extrusive (volcanic) rocks form. Their crystals will appear small or nonexistent. You may need a microscope to view these crystals. Extrusive textures include: Aphanitic: ● Glass: Porphyritic:_ In addition to crystal size, we can also try to group igneous rocks based on their metal: silica ratio. For each of the following terms, list some minerals that fit those categories. Ultramafic: Mafic: Intermediate:__ Felsic: Porphyritic Andesite Granite Pegmatite

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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**Lab: Igneous Rock Identification** Igneous Rocks are Earth materials made from the cooling and/or crystallization of molten rock. Igneous Rocks are not classified solely on their chemical composition (as were minerals), but rather, they are classified based on the existence and/or size of the crystals which comprise them. If magma cools underground, then **intrusive** (plutonic) rocks form. Their crystals will be large (that is, you can see them with the naked eye.) Intrusive textures include: - **Phaneritic:** ______________________________________ - **Pegmatitic:** ______________________________________ If lava cools at the surface, then **extrusive** (volcanic) rocks form. Their crystals will appear small or nonexistent. You may need a microscope to view these crystals. Extrusive textures include: - **Aphanitic:** ______________________________________ - **Glass:** ______________________________________ - **Porphyritic:** ______________________________________ In addition to crystal size, we can also try to group igneous rocks based on their metal: silica ratio. For each of the following terms, list some minerals that fit those categories. - **Ultramafic:** ______________________________________ - **Mafic:** ______________________________________ - **Intermediate:** ______________________________________ - **Felsic:** ______________________________________ Images: - **Porphyritic Andesite**: A rock sample with a mix of fine and larger crystals, indicating different cooling rates. - **Granite Pegmatite**: A rock sample showing very large and visible crystals, typical of pegmatitic textures, suggesting slow cooling deep underground.
Transcribed Image Text:**Lab: Igneous Rock Identification** Igneous Rocks are Earth materials made from the cooling and/or crystallization of molten rock. Igneous Rocks are not classified solely on their chemical composition (as were minerals), but rather, they are classified based on the existence and/or size of the crystals which comprise them. If magma cools underground, then **intrusive** (plutonic) rocks form. Their crystals will be large (that is, you can see them with the naked eye.) Intrusive textures include: - **Phaneritic:** ______________________________________ - **Pegmatitic:** ______________________________________ If lava cools at the surface, then **extrusive** (volcanic) rocks form. Their crystals will appear small or nonexistent. You may need a microscope to view these crystals. Extrusive textures include: - **Aphanitic:** ______________________________________ - **Glass:** ______________________________________ - **Porphyritic:** ______________________________________ In addition to crystal size, we can also try to group igneous rocks based on their metal: silica ratio. For each of the following terms, list some minerals that fit those categories. - **Ultramafic:** ______________________________________ - **Mafic:** ______________________________________ - **Intermediate:** ______________________________________ - **Felsic:** ______________________________________ Images: - **Porphyritic Andesite**: A rock sample with a mix of fine and larger crystals, indicating different cooling rates. - **Granite Pegmatite**: A rock sample showing very large and visible crystals, typical of pegmatitic textures, suggesting slow cooling deep underground.
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