Igneous rock types Flashcards
(6 cards)
1
Q
Andesite
A
a fine grained (aphantitic), intermediate igneous rock that forms from lava cooling at or near the earths surface
2
Q
Gabbro
A
a coarse-grained igneous rock that is primarily composed of mafic minerals, which are rich in iron and magnesium, a intrusive rock, phaneritic
3
Q
Granite
A
coarse grained igneous rock that is primarily composed of quartz, feldspar and mics, very common
4
Q
Pumice
A
lightweight porous volcanic rock that forms during explosive volcanic eruptions, bubbly
5
Q
Rhyolite
A
extrusive igneous rock that is volcanic equivalent of granite, rich in silica and typically has light color
6
Q
Scoria
A
a vesicular volcanic rock that is formed from lava that is rich in gas content
