metamorphic
Likely slate
Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz
AI-generated identification · may be incorrectDark gray-green, dull, and fine-grained, with a flat, layered appearance suggesting slaty cleavage. Typical slate hardness is about 3–4 Mohs; exact properties cannot be confirmed from the image.
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Physical properties
Dark gray-green, dull, and fine-grained, with a flat, layered appearance suggesting slaty cleavage. Typical slate hardness is about 3–4 Mohs; exact properties cannot be confirmed from the image.
Formation & geological history
Forms when shale or mudstone is weakly metamorphosed under heat and pressure, commonly during mountain-building. Its age depends on the source formation and cannot be determined visually.
Uses & applications
Slate is used for roofing, flooring, paving, and decorative items; this small rough fragment is mainly a teaching or collection specimen.
Geological facts
Slate splits into thin, relatively flat sheets along cleavage planes, a useful feature distinguishing it from many other rocks.
Field identification & locations
The pictured fragment appears consistent with slate, but identification from an image is uncertain. Look for fine grain and repeated flat splitting surfaces; slate occurs in metamorphic regions worldwide.
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