Petro Lab Final Flashcards
1
Q
Dunite
A
90% Olivine
2
Q
Peridotite
A
50% Olivine, 50% Pyroxene
3
Q
Pyroxenite
A
70% Pyroxene
4
Q
Kimberlite
A
Green and black conglomerate
5
Q
Gabbero
A
50% Plagioclase, 50% pyroxene
6
Q
Basalt
A
Black, no visible crystals, pure groundmass
7
Q
Diabase
A
70% plagioclase, 30% pyroxene. Elongated white in black
8
Q
Anothosite
A
90% Plagioclase
9
Q
Scoria
A
Non glassy volcano fizz
10
Q
Basaltic Glass
A
Non obsidian glass fizz
11
Q
Tektite
A
Volcanic bomb
12
Q
Diorite
A
Black and white, no quartz
13
Q
Andesite
A
No k-spar, only plag
Look for hornblende and pray
14
Q
Syenite
A
Big k-spar crystals
No plag, only k-spar
15
Q
Trachyte
A
Invisible groundmass with K-spar
Typically gray groundmass with white spar inclusions
16
Q
Granite
A
Syenite + quartz
k-spar and quartz
17
Q
Granodiorite
A
quartz + 1/2 plagioclase and 1/2 Alkalis
18
Q
Tonolite
A
lighter, more plagioclase than anything
