metamorphic
Slate
Foliated Metamorphic Rock
Dull luster, grey to black color, fine-grained texture, breaks along flat planes (slaty cleavage), hardness of 2.5-4 on Mohs scale.
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Physical properties
Dull luster, grey to black color, fine-grained texture, breaks along flat planes (slaty cleavage), hardness of 2.5-4 on Mohs scale.
Formation & geological history
Formed from low-grade regional metamorphism of shale or mudstone under relatively low pressure and temperature conditions.
Uses & applications
Used for roofing shingles, flooring, chalkboards, billiard tables, and garden landscaping due to its durability and splitting properties.
Geological facts
Slate can split into very thin sheets while maintaining high strength; it was historically the primary material for school writing tablets.
Field identification & locations
Identify by its fine grain and ability to split into thin sheets. Found in mountain ranges and regions that underwent ancient tectonic plate collisions.
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