Week 4: Metamorphic rocks to know
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6 Terms
What are characteristics of slate?
Foliated-Slaty cleavage (parallel flat orientation)
Fine-grained
Low grade metamorphic
What are the characteristics of Phyllite?
Fine-grained
mica-rock
forms by the metamorphic alternation of slate
has a silky sheen (phyllitic luster)
What are the characteristics of Schist?
Fine to coarsely grained
Larger micas which indicates medium to high-grade metamorphism
Foliated-schistosity
What are the characteristics of Gneiss?
Has distinct compositional bands
Compromised of light bands of felsic minerals (quartz and feldspar)
Alternating with dark bands of mafic minerals (biotite or amphibole)
What are characteristics of quartzite?
Protolith is quartz sandstone
Sand grains recrystallize and fuse
Is hard, glassy, and resistant
What are the characteristics of marble?
Coarsely crystalline calcite or dolomite
Protolith is either limestone or dolostone
Recrystallization obliterates original textures and fossils