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13 Cards in this Set
- Front
- Back
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Pumice (Igneous) |
highly vesicular, extremely porous volcanic rock. typically intermediate/felsic. no identifiable minerals. extremely light. matrix is glassy |
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Diorite (Igneous) |
intermediate plutonic rock. contains essential Ca/Na plagioclase feldspar. looks black and white ("salt and pepper"). phaneritic texture |
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granite (igneous) |
light colored plutonic rock. contains essential k-feldspar and quartz. commonly contains 30% Na plagioclase. common accessory minerals may include biotite, muscovite, and hornblende. felsic. scratches glass. |
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scoria (igneous) |
more sense than water. highly vesicular volcanic rock. typically mafic/intermediate in composition. matrix is aphanitic. may contain a few phenocrysts. light grey -> dark grey -> brick red color |
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Amygdaloidal Basalt (Igneous) |
Back (Definition) |
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Gabbro (Igneous) |
dark colored plutonic rock. contains essential Ca-Plagioclase feldspar and/or pyroxene, or olivine/hornblende. common accessory minerals may include olivine, Na plagioclase, and magnetite. appears kind of speckled |
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Porphyritic Andesite (Igneous) |
light grey colored, intermediate felsic rock. contains essential Ca/Na plagioclase feldspar. pyroxene and/or hornblende are essential mafic minerals. phenocrysts of hornblende and feldspars are commonly identifiable. this particular one looks light grey with small specs of black |
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Syenite (Igneous) |
light colored (tan ish?) plutonic rock, containing essential k feldspar and up to 30% Na plagioclase. very little to no quartz. common accessory minerals may include biotite, muscovite, and hornblende |
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Basalt (Igneous) |
dark grey to black colored. mafic volcanic rock, containing essential Ca Plagioclase feldspar and pyroxene, olivine, and/or hornblende. phenocrysts of olivine and feldspar are commonly identifiable, but not necessarily, this one looks black and plain |
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Rhyolite (Igneous) |
pale pink-> tan/sandy color. felsic volcanic rock, containing essential k feldspar and quartz, and commonly contains up to 30% Na-plagioclase. phenocrysts of k-feldspar, biotite, quartz are commonly identifiable |
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Porphyritic Granite (Igneous) |
plutonic rock containing essential k feldspar and quartz. this one has large crystals (black, pale pink, + light grey) |
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Trachyte (Igneous) |
Fine-grained rock with huge crystals that are lighter in color. Light grey colored, felsic volcanic rock containing essential k-feldspar in addition to plagioclase feldspar. phenocrysts of k feldspar are commonly identifiable |
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Vesicular Basalt (Igneous) |
dark grey to black colored, mafic volcanic rock, containing essential Ca plagioclase feldspar and pyroxene, olivine, and/or hornblende. phenocrysts of olivine and feldspars are commonly identified. this rock contained dissolved gas, making it vesicular. green phenocrysts |
