metamorphic

Likely gray slate or fine-grained argillite fragment

Slate, a low-grade metamorphic rock derived from shale; exact identification is uncertain from the image

AI-generated identification · may be incorrect

Dull gray-green, fine-grained and apparently flat-cleaving; slate is typically Mohs 3–4, with microscopic mica and quartz and no visible crystals. The small, out-of-focus specimen prevents reliable confirmation of hardness or composition.

Identified September 28, 2026More metamorphic →

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Physical properties

Formation & geological history

Forms when shale or mudstone is compressed and mildly metamorphosed, developing slaty cleavage; it occurs in metamorphic belts of many geological ages.

Uses & applications

Slate is used for roofing, floor tiles, paving, blackboards, and decorative pieces; this small fragment has little commercial value.

Geological facts

Slate splits into thin, relatively flat sheets because pressure aligns fine-grained minerals.

Field identification & locations

Look for a fine, uniform texture and repeated flat splitting surfaces; common slate regions include Wales, Spain, and the northeastern United States. A fresh surface and hardness test would help distinguish it from other gray rocks.