Term
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Definition
granite
Intrusive
Color index- Felsic
Texture- phaneritic
Minerals- quartz, feldspars
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Term
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Definition
Basalt
Extrusive
color index- Mafic
texture- Aphanitic
minerals- feldspars, pyroxene, olivine
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Term
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Definition
obsidian
extrusive
color index- Felsic-intermediate-mafic
texture- glassy
minerals- quartz (pure SiO2) |
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Term
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Definition
Pumice
Extrusive
color index- felsic-intermediate
texture- galssy
minerals- quartz, feldspars, amphibale |
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Term
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Definition
Scoria
Extrusive
color index- Mafic
texture- vesicular
minerals- feldspars, olivine, pyroxene, amphibole |
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Term
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Definition
Andesite
Extrusive
color index- intermediate
texture- aphanitic fine grained
minerals- feldspar, pyroxene, amphibole |
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Term
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Definition
peridotite
intrusive
color index- ultramafic
texture- phaneritic coarse grained
minerals- olivine, pyroxene |
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Term
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Definition
Diorite
Intrusive
color index- intermeniate
texture- phaneritic coarse grained
minerals- feldspars, pyroxene, amphibole |
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Term
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Definition
Gabbro
Intrusive
color index- mafic
texture- phaneritic coarse grained
minerals- feldspar, olivine, pyroxene, amphibole |
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Term
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Definition
Rhyolite
Extrusive
color index- felsic
texture- aphanitic fine grained
minerals- K-spar, quartz, muscovite |
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Term
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Definition
Pegmatitic granite
Intrusive
color index- felsic
texture- pegmatitic very coarse grained
minerals- k-spar, quartz, muscovite |
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Term
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Definition
-rocks that cool very slowley beneath the earth
-crystals are large in size, greater than 1mm |
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Term
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Definition
| crystals that are visible to the naked eye (1mm-1cm) |
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Term
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Definition
| Extremely large crystals (>1cm) |
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Term
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Definition
- Cool rapidly at the surface of the earth
- very tiny crystals, not enough time for them to develope |
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Term
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Definition
| Very small or not visible crystals (<1mm) |
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Term
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Definition
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Term
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Definition
| rock containes air bubbles |
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Term
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Definition
| containes large and small cyrystals |
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Term
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Definition
| Very large, gentley sloping broad volcano with large crater opening. Low viscosity. (ex. Hawaii) |
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Term
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Definition
| small, steep-sloping, cone-shaped with wide crater opening. small explosive eruptions. |
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Term
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Definition
| steep sloping, cone shaped, with small crater opening. medium to high viscosity, lots of trapped gasses. large explosive eruptions. |
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