metamorphic

Quartz-bearing metamorphic rock, likely schist or quartzite

Quartz (SiO₂) in a mica-rich metamorphic matrix

AI-generated identification · may be incorrect

Gray to brown, translucent vitreous quartz with dark flaky mica and weathered iron staining; quartz hardness 7, mica about 2–3, with irregular fracture and schistose texture. The specimen appears granular and foliated rather than a single crystal.

Identified September 7, 2026More metamorphic →

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Physical properties

Formation & geological history

Formed when quartz-rich sedimentary or igneous material underwent heat and pressure, probably during regional metamorphism; its exact geological age cannot be determined from the photograph. Common in metamorphic mountain belts and contact zones.

Uses & applications

Used mainly as a teaching, lapidary, and collector specimen; quartz-rich metamorphic stone may be used locally as aggregate or decorative rock, but this piece is too small and irregular for construction.

Geological facts

The translucent gray areas are likely massive quartz, while the dark reflective flakes may be biotite or graphite. Iron oxidation commonly produces the brown-orange weathering visible on exposed surfaces.

Field identification & locations

Look for interlocking quartz grains, mica foliation, and a hard scratch-resistant quartz component; a steel knife will not scratch quartz, but may scratch mica. Common worldwide in regions containing schist and quartzite.