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Igneous Textures
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23
Geology
Undergraduate 3
03/31/2014
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Term
Phaneritic
 Definition
Visible Grains
Term
Aphanreitic
 Definition
Non-Visible Grains
Term
Porphyritic
 Definition
Visible grain in fine grained background
Term
Pegmatitic
 Definition
Large crystals
Term
Orbicular
 Definition
Spherical crystal growth
Term
Brecciated
 Definition
angular pieces stuck together by igneous material
Term
Glass
 Definition
disorganized solid, incompletely crystallized
Term
Porphyroblast
 Definition
large pieces in a porphyritic material
Term
Inclusions
 Definition
included in
Term
Xenoliths
 Definition
rocks not part of igneous material
Term
Columnar
 Definition
basalt "mud cracks"
Term
Komatiite
 Definition
greenish crystals
Term
Basalt
 Definition
black
Term
Andesite
 Definition
grey
Term
Ryolite
 Definition
white
Term
Vesicular
 Definition
Holey rock, basaltic bubble spaces
Term
Scoria
 Definition
glassy - more bubbles than rock
Term
Aa
 Definition
brecciated basalt
Term
Pahoehoe
 Definition
Ropy basalt
Term
Obsidian
 Definition
basalt or standard
Term
Pumice
 Definition
Large air space, lightweight
Term
Ash
 Definition
tiny broken glass
Term
Tuff
 Definition
Ash fall or ash flow
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