mineral

Likely quartz-bearing rock fragment

Quartz (SiO₂), possibly in a weathered granitoid or metamorphic matrix

AI-generated identification · may be incorrect

Small irregular gray-brown fragment with translucent, glassy-to-dull luster and apparent granular texture; quartz hardness is Mohs 7, with no cleavage and conchoidal fracture. Exact identification is limited by the photograph and specimen size.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in a silica-rich igneous or metamorphic rock, then liberated by weathering and erosion; its age cannot be determined visually. Common source rocks include granite, gneiss, quartzite, and hydrothermal veins.

Uses & applications

Unexceptional fragments have no industrial or jewelry value, though quartz is widely used in glass, ceramics, electronics, abrasives, and engineered stone.

Geological facts

Gray coloration may result from inclusions, iron staining, or a mixture of quartz with feldspar and mica rather than pure quartz.

Field identification & locations

Look for glassy translucence, hardness greater than steel, lack of cleavage, and quartz-rich grains; a streak test, hardness test, and magnification would help confirm it. Quartz-bearing rocks are widespread worldwide, especially in granitic terrains and stream gravels.