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15 Cards in this Set
- Front
- Back
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What are the two main categories of igneous rocks?
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Intrusive and Extrusive
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What do felsic igneous rocks have a high percentage of?
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Silicon (Si) and Aluminum (Al)
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What do mafic igneous rocks have a high percentage of?
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Iron (Fe) and Magnesium (Mg)
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What textures can intrusive igneous rocks have?
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Coarse or Very Coarse
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What textures can extrusive igneous rocks have?
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Glassy, Fine, or Vesicular
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Describe a vesicular texture.
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The rock has small air holes that formed when the lava cooled around gas bubbles.
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What type of igneous rocks forms from lava?
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Extrusive
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What type of igneous rocks forms from magma?
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Intrusive
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Describe the relationship between the cooling rate of magma/lava and the size of the crystals in an igneous rock.
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The longer the cooling time the bigger the crystals.
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Describe the relationship between color and density in igneous rocks.
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Lighter colored rocks tend to be less dense than darker colored rocks.
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What is the relationship between rocks like Andesite and Diorite and the minerals Quartz and Pyroxene?
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Maybe the minerals are present in the rocks, maybe not (see ESRT).
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What is another name for Hornblende?
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Amphibole (ESRT p. 16)
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Where do intrusive igneous rocks form?
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Inside of earth, or below the earth's surface
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Where do exrusive igneous rocks form?
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At, or above, earth's surface
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What processes are involved in the formation of an igneous rock?
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Melting and solidification. (ESRT rock cycle)
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