metamorphic
Slate
Metamorphic Pelitic Rock
AI-generated identification · may be incorrectHardness of 3-4 on Mohs scale, typically gray to dark blue-gray, dull to sub-metamorphic luster, fine-grained foliated texture with pronounced slaty cleavage.
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Physical properties
Hardness of 3-4 on Mohs scale, typically gray to dark blue-gray, dull to sub-metamorphic luster, fine-grained foliated texture with pronounced slaty cleavage.
Formation & geological history
Formed by low-grade regional metamorphism of shale or mudstone under moderate pressure and low temperature.
Uses & applications
Historically used for roofing tiles, chalkboards, billiard tables, and flooring.
Geological facts
Slate's strong planar cleavage allows it to be split into thin, durable sheets.
Field identification & locations
Identified by its fine grain and distinct parallel splitting; commonly found in mountainous or ancient basin regions including California.
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