metamorphic
Slate
Metamorphic pelitic rock
AI-generated identification · may be incorrectHardness 3-4 on Mohs scale, typically dark gray to black, dull to sub-sheen luster, fine-grained foliated crystal structure with pronounced slaty cleavage, specific gravity of 2.7-2.8.
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Physical properties
Hardness 3-4 on Mohs scale, typically dark gray to black, dull to sub-sheen luster, fine-grained foliated crystal structure with pronounced slaty cleavage, specific gravity of 2.7-2.8.
Formation & geological history
Formed through low-grade regional metamorphism of shale or mudstone, typically during ancient tectonic mountain-building events.
Uses & applications
Used in roofing, flooring, architectural paving, and traditional writing chalkboards.
Geological facts
Slate splits easily into thin, flat sheets due to microscopic clay minerals realigning under extreme pressure.
Field identification & locations
Identify in the field by its distinct planar cleavage, fine grain, and dull ringing sound when struck. Common worldwide in ancient mountain belts.
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