Metamorphic Rock Identification
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7 Terms
Gneiss
Grain Size: Medium to Coarse
Fabric/Texture: Foliation/Mineral Banding
Mineralogy: Quartz, feldspar, mica, hornblende
Metamorphic Grade: High
Protolith: Shale, granite
Schist
Grain Size: Varies
Fabric/Texture: Foliation, Schistosity
Mineralogy: Quartz, feldspar, micas, sometimes chlorite
Metamorphic Grade: Medium to High
Protolith: Shale, basalt
Phyllite
Grain Size: Fine
Fabric/Texture: Foliation, slight schistosity
Mineralogy: Quartz, feldspar, mica, sometimes chlorite
Metamorphic Grade: Medium to High
Protolith: Shale
Slate
Grain Size: Very fine
Fabric/Texture: Foliated, slaty cleavage
Mineralogy: Minor clay, micas, quartz, feldspar
Metamorphic Grade: Low
Protolith: Shale
Quartzite
Grain Size: Medium
Fabric/Texture: Massive
Mineralogy: Quartz, mica, some feldspar
Metamorphic Grade: Low to High
Protolith: Quartz Sandstone
Marble
Grain Size: Medium to Coarse
Fabric/Texture: Massive
Mineralogy: Calcite
Metamorphic Grade: High
Protolith: Limestone
Serpentinite
Grain Size: Fine to Medium
Fabric/Texture: Massive
Mineralogy: Serpentine
Metamorphic Grade: Low
Protolith: Peridotite
Note 
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