metamorphic
Slate
Metamorphic pelitic rock
AI-generated identification · may be incorrectMohs hardness 3 to 4, dark grey to black color, dull to sub-lustrous, fine-grained foliated crystal structure with pronounced slaty cleavage and low specific gravity of 2.7 to 2.8.
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Physical properties
Mohs hardness 3 to 4, dark grey to black color, dull to sub-lustrous, fine-grained foliated crystal structure with pronounced slaty cleavage and low specific gravity of 2.7 to 2.8.
Formation & geological history
Formed through low-grade regional metamorphism of shale or mudstone under intense directed pressure, typically during mountain-building events over hundreds of millions of years.
Uses & applications
Widely used in construction for roofing tiles, flooring, and architectural cladding, as well as historically for chalkboards and billiard tables.
Geological facts
Slate exhibits prominent rock cleavage allowing it to be split into thin, flat sheets. It preserves fine-grained fossils and withstands weathering exceptionally well.
Field identification & locations
Identified by its fine grain, dull luster, and flat, parallel sheets along cleavage planes. Commonly found in mountainous regions worldwide with ancient sedimentary basins.
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