mineral

Quartz-rich rock fragment, possibly iron-stained quartz

Likely microcrystalline or massive quartz (SiO₂); exact identification is uncertain from the image

AI-generated identification · may be incorrect

Gray-white, dull to slightly glassy surface with a rusty-brown patch; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The fragment’s texture and specific gravity cannot be established from the photo.

Identified October 9, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly forms as veins or in silica-rich rocks when mineral-bearing fluids cool; its age and geological setting cannot be determined from the specimen alone.

Uses & applications

Quartz is widely used in glass, electronics, abrasives, and decorative stone; this small, unpolished piece has little practical or jewelry value.

Geological facts

The brown area may be iron-oxide staining or attached host material, rather than part of the quartz itself.

Field identification & locations

A hard scratch on glass and lack of cleavage can support a quartz identification; common worldwide in veins and many rock types. A closer view or hardness test would help distinguish it from other gray stones.