metamorphic

Foliated metamorphic rock, likely schist or gneiss

Quartz–feldspar–mica schist/gneiss; exact identification requires a fresh surface and tests

AI-generated identification · may be incorrect

Gray to brown, coarse-grained, weakly to strongly foliated, with sparkly mica and pale quartz/feldspar. Typical hardness is about 2–7 depending on mineral; mica has perfect cleavage, while quartz is glassy and hard.

Identified September 1, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when shale or granitic protolith was buried and subjected to elevated temperature and pressure, producing aligned mica and recrystallized minerals. Usually Precambrian to Paleozoic in exposed continental metamorphic belts.

Uses & applications

Used locally as dimension stone, building facing, landscaping rock, and aggregate; attractive pieces may be collected, though this specimen appears common and unpolished.

Geological facts

The platy sparkle and planar mineral alignment distinguish schist from massive igneous rocks; abundant mica suggests schist, whereas more banded, quartz–feldspar-rich material suggests gneiss.

Field identification & locations

Look for foliation, mica flakes, quartz-rich lenses, and alternating light/dark bands; common in mountain belts worldwide, including the Appalachians, Rockies, Alps, and Himalaya. A streak, hardness, and fresh-break examination would refine the ID.