Igneous Classification Table Flashcards
1
Q
Silicic minerals silica percentage
A
> 66%
2
Q
Intermediate minerals silica percentage
A
52-66%
3
Q
Mafic minerals silica percentage
A
45-52%
4
Q
Ultramafic minerals percentage
A
<45%
5
Q
Glassy Silicic
A
Obsidian
6
Q
Fine silicic
A
Pumice, rhyolite
7
Q
Medium silicic
A
Microgranite
8
Q
Coarse silicic
A
Granite, granodiorite
9
Q
Minerals found in silicic rocks
A
Quartz, k feldspar, plagioclase (Na), biotite, muscovite
10
Q
Fine intermediate
A
Andesite
11
Q
Medium intermediate
A
Microdiorite
12
Q
Coarse intermediate
A
Diorite, granodiorite
13
Q
Minerals found in intermediate rocks
A
Quartz (rare), k feldspar, plagioclase (Na), Biotite, Hornblende
14
Q
Glassy mafic
A
Scoria
15
Q
Medium mafic
A
Dolerite
