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11 Cards in this Set
- Front
- Back
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Rhyolite |
texture: aphanitic (fine-grained) compostion: felsic mineral content: mostly quartz and potassium feldspars **may contain glass fragments and vesicles |
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Basalt |
texture: aphanitic (fine-grained) composition: mafic mineral content: pyroxene and calcium rich plagioclase feldspar **most common extrusive igneous rock |
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obsidian |
texture: glassy composition: felsic mineral content: forms when highly silica-rich lava cools quickly at earth's surface |
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granite |
texture: phaneritic (coarse-grained) composition: felsic mineral content: over 25% quarts ~65% or more feldspar **very abundant **mountain building **may contain biotite and/or muscovite mica |
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gabbro |
texture: phaneritic (coarse-grained) composition: mafic mineral content: pyroxene & plagioclase feldspar **significant % of the oceanic crust
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volcanic tuff |
texture: pyroclastic compostion: tiny ash-size fragments mineral content: identified with a modifier exa. rhylotite tuff
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andesite |
texture: aphanitic (fine-grained) composition: intermediate (andesitic) mineral content: amphibole, plagioclase feldspar |
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peridotite |
texture: phaneritic (coarse grained) composition: ultramafic mineral content: olivine and pyroxene |
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volcanic breccia |
texture: pyroclastic composition: particles larger than ash in volcanic eruption mineral content: identified with a modifier |
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diorite |
texture: phaneritic (coarse grained) composition: andesitic (intermediate) mineral content: plagioclase feldspar and amphibole |
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pumice |
texture: vesicular (also glassy) composition: felsic mineral content: volcanic, formed when large amounts of gas escape through silica-rich lava |
