metamorphic

Likely garnet-bearing schist or gneiss

Mica schist/gneiss containing quartz, feldspar, mica, and probable almandine garnet

AI-generated identification · may be incorrect

Coarse, irregularly foliated rock with reddish-brown and gray minerals, pale quartz/feldspar patches, and a dull to slightly sparkling luster. Typical hardness is about 5–7; garnet grains are ~6.5–7.5, with no obvious cleavage on the weathered surface.

Identified September 8, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when clay-rich sedimentary or igneous protoliths underwent medium- to high-grade regional metamorphism, commonly during mountain building millions to billions of years ago. Exact identification requires a fresh surface and mineral tests.

Uses & applications

Primarily used as a decorative or landscaping stone and as a teaching/collecting specimen; attractive garnet crystals can add modest specimen value, but this sample does not appear gem quality.

Geological facts

The reddish grains may be garnet, while the silvery material may be mica; foliation and mineral segregation distinguish schist or gneiss from ordinary granite.

Field identification & locations

Look for planar layering, mica sparkle, quartz-rich bands, and hard red-brown garnet grains. Common in metamorphic mountain belts worldwide; a streak, hardness, magnetism, and close-up inspection would refine the identification.