mineral

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly polycrystalline quartzite

AI-generated identification · may be incorrect

White to gray, opaque-to-translucent, with a dull to glassy luster and no obvious cleavage; quartz has Mohs hardness 7 and specific gravity about 2.65. The rounded surface appears weathered or tumbled, limiting confident identification from the image.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich fluids or igneous melts; quartzite forms when sandstone is metamorphosed. Quartz deposits range from Precambrian to modern, while the specimen’s exact age and formation cannot be determined visually.

Uses & applications

Used in glass, ceramics, electronics, abrasives, engineered stone, and construction; attractive pieces may be collected or polished.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly produces a white streak. A steel nail should not scratch it, although an unweathered quartz surface can scratch glass.

Field identification & locations

Look for glassy fracture, hardness, and lack of cleavage; acid reaction would be absent. Common worldwide in veins, pegmatites, river gravels, and quartzite outcrops.