Term
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Definition
Slate
is a low grade metamorphic rock generally formed by the metamorphosis of mudstone / shale, or sometimes basalt, under relatively low pressure and temperature conditions.
Foliated
Regional Metamorphism |
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Term
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Definition
phyllite
a fine-grained metamorphic rock with a well-developed laminar structure, intermediate between slate and schist in degree of metamorphism.
Foliated
Regional Metamorphism
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Term
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Definition
Garnet Schist
Foliated
Regional |
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Term
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Definition
Biotite Schist
Foliated
Regional |
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Term
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Definition
Muscovite Schist
Foliated
Regional |
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Term
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Definition
Migmatite
a high grade metamorphic rock that has undergone partial melting.
Foliated
Regional |
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Term
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Definition
Gneiss AKA Zebra Rock
A high grade foliated metamorphic rock with banded appearance formed by regional metamorphism. Protolith = schist, granite, or volcanic rocks. |
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Term
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Definition
Marble
A metamorphic rock consisting of fine- to coarse-grained recrystallized calcite. Protolith = limestone.
Nonfoliated
Regional |
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Term
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Definition
Quartzite
Nonfoliated
Regional |
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Term
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Definition
Serpentine
Always green
Nonfoliated
Hydrothermal
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Term
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Definition
Blue Schist
Always Blue
Foliated
Regional |
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Term
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Definition
Anthracite
is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest calorific content of all types of coal except for graphite.
Nonfoliated
Contact or regional
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