metamorphic
Weathered slate
Slate, a fine-grained metamorphic rock composed mainly of mica, chlorite, and quartz
AI-generated identification · may be incorrectTypically gray to rusty red-brown with a dull to slightly silky luster and fine-grained texture; hardness about 3–4 Mohs. Slate commonly splits along flat cleavage planes; the image shows layered, fractured slabs with iron-oxide staining.
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Physical properties
Typically gray to rusty red-brown with a dull to slightly silky luster and fine-grained texture; hardness about 3–4 Mohs. Slate commonly splits along flat cleavage planes; the image shows layered, fractured slabs with iron-oxide staining.
Formation & geological history
Forms when shale or mudstone is compressed and weakly metamorphosed, commonly during regional mountain-building. Its age depends on the source formation and cannot be determined from the image.
Uses & applications
Used for roofing, paving, flooring, and decorative stone; this rough, weathered material has little gemstone value.
Geological facts
Rusty coloration commonly results from iron-bearing minerals weathering to iron oxides.
Field identification & locations
Look for fine grain and the tendency to split into thin, flat sheets; slate occurs in metamorphic belts worldwide, including Wales, Spain, and the northeastern United States.
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