METAMORPHIC ROCK Flashcards
1
Q
how to metamorphic rocks form
A
minerals in pre-existing rock deep in crust change shape, size or composition through significant increase in pressure and temperature forming new rock
2
Q
classifications of metamorphic rocks
A
schist
gneiss
granofels
3
Q
what is schist
A
Well-developed schistosity
4
Q
what is gneiss
A
Poorly developed schistosity
5
Q
what is granofels
A
Schistosity is absent (granular)
6
Q
what is schistosity
A
layering in coarse-grained rocks due to parallel arragement of platy minerals
7
Q
what is well-developed schistosity
A
high degree of preferred orientation → rock will split on a scale of less than 1 cm
8
Q
what is poorly developed schistosity
A
low degree of preferred orientation → rock will split on a scale of more than 1 cm
