metamorphic
Likely slate
Slate; fine-grained rock composed mainly of quartz, mica and/or chlorite
AI-generated identification · may be incorrectGray, dull to slightly lustrous, fine-grained and smooth; commonly splits along flat cleavage planes. Individual mineral hardness varies, with quartz at Mohs 7.
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Physical properties
Gray, dull to slightly lustrous, fine-grained and smooth; commonly splits along flat cleavage planes. Individual mineral hardness varies, with quartz at Mohs 7.
Formation & geological history
Formed when shale or mudstone was compressed and weakly metamorphosed at low temperature and pressure; its age depends on the source formation.
Uses & applications
Used for roofing, paving, floor tiles, writing slates and decorative stone.
Geological facts
Slate’s pronounced slaty cleavage allows it to split into thin, durable sheets.
Field identification & locations
The pictured gray, fine-textured specimen appears consistent with slate, though the image is not detailed enough for definitive identification. Slate is common in metamorphic regions worldwide; look for thin layers and flat splitting surfaces.
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