metamorphic

Weathered quartz-mica schist

Quartz–muscovite/biotite schist, locally iron-oxide stained

AI-generated identification · may be incorrect

Composed mainly of quartz, mica, and feldspar with abundant brown-red hematite/goethite staining. Hardness is approximately 2–7 depending on grain; quartz-rich surfaces are hard and vitreous, while mica produces sparkling, platy reflections and schistose foliation.

Identified September 8, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sedimentary or igneous rock underwent regional metamorphism, causing mica alignment and foliation; iron-bearing minerals later oxidized during weathering. Exact geological age cannot be determined from the photograph.

Uses & applications

Used locally as decorative stone, landscaping material, and occasionally crushed aggregate; attractive mica sparkle can make it a collector specimen, but it is generally not a gemstone.

Geological facts

The planar texture and glittering flakes are characteristic of schist rather than massive granite. Rusty coloration commonly records weathering of iron-bearing biotite or sulfide minerals.

Field identification & locations

Identify it by visible foliation, flaky mica, quartz-rich light patches, and reddish-brown oxidation. Common in regional metamorphic belts worldwide; a hand lens, streak test, and examination of fresh broken surfaces would improve certainty.