metamorphic
Slate
Metamorphic pelitic rock
AI-generated identification · may be incorrectHardness of 3 to 4 on the Mohs scale, typically gray to black, dull luster, foliated crystal structure with pronounced slaty cleavage.
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Physical properties
Hardness of 3 to 4 on the Mohs scale, typically gray to black, dull luster, foliated crystal structure with pronounced slaty cleavage.
Formation & geological history
Formed by low-grade regional metamorphism of shale or mudstone under intense heat and directional pressure over millions of years.
Uses & applications
Extensively used in roofing, flooring, billiard tables, and traditional writing blackboards.
Geological facts
Slate exhibits prominent foliation allowing it to split easily into thin, flat, durable sheets.
Field identification & locations
Easily identified in the field by its distinct parallel cleavage planes and fine-grained texture; commonly found in mountain-building belts.
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