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Texas A&M Geology 101
Lab Review: Igneous Rocks
7
Geology
Undergraduate 1
02/22/2010
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Term
Intrusive rock Textures
 Definition
Pegmatitic, Phaneritic, and sometimes Porphyritic
Term
Extrusive rock textures
 Definition
Aphanitic, glassy, vesicular, and Pyroclastic/Fragmental
Term
Felsic
 Definition
Light colored
Term
mafic
 Definition
Dark colored
Term
Intermediate
 Definition
between felsic and mafic
Term
Ultramafic
 Definition
Technically darker than mafic, it has a green tint due to high amounts of olivine.
Term
Look over textures.
 Definition
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