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Igneous Rock Textures
N/A
7
Geology
Undergraduate 1
02/17/2014
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Term
Aphanitic
 Definition
Fine- Grained Texture
Term
Phaneritic
 Definition
Course- Grained Texture
Term
Porphyritic
 Definition
Large Crystals (phenocrysts), in a fine- grained matrix (groundmass)
Term
Vesicular
 Definition
Contains a lot of porous holes
Term
Glassy
 Definition
No crystalline structure due to rapid cooling
Term
Pyroclastic
 Definition
Composed of fragments
Term
Pegmatitic
 Definition
Abnormally large crystals
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