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Definition
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Term
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Definition
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Term
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Definition
Form as molten rock cools and solidifies
Extrusive
Intrusive |
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Term
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Definition
Plutonic Rocks
Formed by cooling below the surface |
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Definition
Volcanic Rocks
Formed by cooling above the surface |
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Term
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Definition
Granitic Composition
Rocks composed almost entirely light colored silicates and sodium rich plagioclase feldspare |
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Definition
Basaltic Composition
Contain substantial dark silicate minerals and calcium rich plagioclase feldspar |
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Term
| Factors Effecting Crystal Size |
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Definition
Big Crystals - Intrusive - Long Cooling
Small Crystals - Extrusive - Fast Cooling |
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Term
| Types of Igneous Textures |
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Definition
Aphanitic
Phaneritic
Porphyritic
Glassy
Pyroclastic
Pegmatic |
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Term
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Definition
Fine Grained
Relatively Rapid Cooling
Vesicular Texture with gas bubbles |
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Definition
Coarse Grained
Slowly crystalize at great depths |
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Term
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Definition
| For a rock that has a distinct difference in the size of the crystals, with at least one group of crystals obviously larger than another group. |
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Definition
Extrusive
Frozen in place - Cooled very quickly |
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Definition
Fragmental
Formed from consolidation of individual rock fragments |
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Term
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Definition
Mineral grains are exceptionally large
Very coarse-grained |
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