metamorphic
Likely slate
Slate, a fine-grained metamorphic rock composed mainly of quartz, mica, and chlorite
AI-generated identification · may be incorrectFlat, angular fragments with brown, gray-green surfaces and fine layering; slate typically has a dull luster, Mohs hardness of about 3–4, and splits along planar cleavage. The image does not show enough detail to confirm the exact rock.
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Physical properties
Flat, angular fragments with brown, gray-green surfaces and fine layering; slate typically has a dull luster, Mohs hardness of about 3–4, and splits along planar cleavage. The image does not show enough detail to confirm the exact rock.
Formation & geological history
Forms when shale or mudstone is compressed and mildly heated during regional metamorphism; it occurs in rocks of many geological ages.
Uses & applications
Commonly used for roofing, paving, flooring, and decorative stone; suitable specimens are also collected.
Geological facts
Slate’s characteristic flat splitting, called slaty cleavage, develops as tiny minerals align under pressure.
Field identification & locations
Look for fine grain and thin, relatively even sheets that break along flat planes; common sources include metamorphic belts worldwide. The rusty-brown color may reflect iron staining.
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