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9 Cards in this Set
- Front
- Back
Basalt |
Aphanitic. Can be vesicular due to gas cavities. Commonly black to very dark grey in color & may have reddish tints. Dominant Minerals include: Plagioclase Augite Hornblende Olivine can be present. |
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Gabbro |
Can be light to nearly black. Light varieties are not as abundant as the dark. Gabbro is darker than Diorite Dominant Minerals: Augite Olivine Plagioclase Can have hornblende |
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Granite #12 |
Phaneritic Porphyritic Dominant Minerals: Orthoclase Quartz Can have biotite, plagioclase, and ferromagnesian Minerals like pryoxene and amphibole |
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Granite #3 |
Phaneritic Dominant Minerals: Orthoclase Quartz Can have hornblende, augite, biotite. |
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Diorite |
Mostly white, however is known to have a salt and pepper appearance. Phaneritic Dominant Minerals: Plagioclase & ferromagnesian Minerals |
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Andesite |
Various shades of pink, gray, purple, or green. Aphanitic, however often have phenocryst of plagioclase and some ferromagnesian mineral. Dominant Mineral: Hornblende Plagioclase |
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Scoria |
Usually brick red in color Dominant minerals include Plagioclase Hornblende Vesicular in texture |
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Pumice |
Contains dominant minerals of Si, O, Al, Fe (silicon, oxygen, aluminum, iron) Very low specific gravity Glassy & vesicular in texture. |
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Peridotite |
Dominant minerals include Olivine with some Pyroxene Color is usually green. |
