Metamorphic rocks
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Metamorphic rocks
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8 Terms
Marble
Protolith: Limestone or dolostone Composition: Calcite (or dolomite) Grade: Low to medium Metamorphism: Usually contact, but can be regional
Quartzite
Protolith: Quartz sandstone Composition: Quartz Grade: medium to high Metamorphism: Contact or regional
Gneiss
Protolith: Granite or schist Composition: Quartz, feldspar, biotite, hornblende Grade: High Metamorphism: Regional
Phyllite
Protolith: Shale -> slate Composition: Mica (muscovite, biotite), chlorite, quartz Grade: Low Metamorphism: Regional
Garnet schist
Protolith: Mudstone or shale Composition: Garnet, mica (muscovite, biotite), quartz Grade: Medium to high Metamorphism: Regional
Mica schist
Protolith: Shale or mudstone Composition: Muscovite, biotite, quartz, feldspar Grade: Medium Metamorphism: Regional
Talc schist (soapstone)
Protolith: Ultramafic rocks (like peridotite) Composition: Talc, chlorite, maybe amphibole Grade: Low Metamorphism: Typically regional, sometimes contact
Slate
Protolith: Shale or mudstone Composition: Mica (very fine), quartz, chlorite Grade: Low Metamorphism: Regional
Note 
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