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 microcrystalline structure with distinct slaty cleavage.
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Physical properties
Hardness of 3 to 4 on the Mohs scale, typically gray to black, dull luster, foliated microcrystalline structure with distinct slaty cleavage.
Formation & geological history
Formed by low-grade regional metamorphism of shale or mudstone under moderate directed pressure, often dating back hundreds of millions of years.
Uses & applications
Used extensively in roofing, flooring, billiards tables, and historical writing slates due to its durability and splitting properties.
Geological facts
Slate splits easily into thin, flat sheets, making it a preferred material for architectural applications for centuries.
Field identification & locations
Identify by its fine grain, parallel foliation, and tendency to break into flat, thin sheets. Common worldwide in mountainous or ancient sedimentary belts.
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