metamorphic

Likely weathered metamorphic rock (possibly schist or gneiss)

Indeterminate; probable mica-rich quartz–feldspar metamorphic rock

AI-generated identification · may be incorrect

Brown-gray, coarse-grained, dull to slightly sparkly, with apparent weak foliation and an uneven fracture; individual minerals are not clear enough for reliable hardness or specific-gravity measurement. Likely Mohs hardness about 5–7, depending on quartz and feldspar content.

Identified September 4, 2026More metamorphic →

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Physical properties

Formation & geological history

Probably formed when preexisting sedimentary or igneous rock was buried and subjected to heat and pressure, producing mineral recrystallization and banding/foliation. Its precise age and metamorphic grade cannot be determined from the photograph.

Uses & applications

Primarily a teaching or collecting specimen; comparable schists and gneisses are used as decorative stone, aggregate, and occasionally dimension stone, but this small piece has no significant commercial value.

Geological facts

The dark, layered appearance may reflect mica- or amphibole-rich bands, while lighter areas may contain quartz or feldspar. A hand lens and fresh broken surface would greatly improve identification.

Field identification & locations

Common in regional metamorphic terrains and exposed mountain belts worldwide. Look for aligned mica flakes, alternating light/dark bands, and a streak that is generally white to gray; estimated value is about $1–$10 for a common hand specimen.