metamorphic
Slate
Metamorphosed pelitic shale
AI-generated identification · may be incorrectHardness of 3-4 on the Mohs scale, typically gray to black, dull to sub-sheen luster, foliated crystal structure with prominent slaty cleavage, specific gravity of 2.6-2.8.
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Physical properties
Hardness of 3-4 on the Mohs scale, typically gray to black, dull to sub-sheen luster, foliated crystal structure with prominent slaty cleavage, specific gravity of 2.6-2.8.
Formation & geological history
Formed through regional metamorphism of low-grade mudstone or shale under moderate pressure and low temperature, typically during mountain-building events.
Uses & applications
Extensively used in roofing, flooring, billiards tables, and decorative landscaping due to its durability and splitting properties.
Geological facts
Slate has been used for centuries as a durable writing surface in schools and architectural roofing materials.
Field identification & locations
Identified by its fine-grained texture, distinct planar foliation, and ability to split into thin, flat sheets; found globally in ancient orogenic belts.
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