mineral

Quartz-rich rock, likely milky quartz

Quartz (silicon dioxide, SiO₂), possibly a quartzite fragment

AI-generated identification · may be incorrect

White to cream, opaque, and rough with a vitreous-to-dull luster; Mohs hardness 7, no cleavage, conchoidal fracture, and generally massive rather than visibly crystalline. The image is insufficient to confirm exact texture or composition.

Identified August 20, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids or forms as a durable vein mineral; quartzite forms when sandstone is metamorphosed. Specimen age depends on its source rock and may range from Precambrian to recent geological settings.

Uses & applications

Used in glass, ceramics, electronics, abrasives, engineered stone, and construction aggregate; attractive pieces may be sold as common mineral specimens.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to accumulate in soils, river gravels, and beaches.

Field identification & locations

Common in quartz veins, granite, pegmatite, metamorphic rocks, and stream deposits worldwide. Test with a steel file or glass (quartz should scratch glass); acid reaction would indicate carbonate rather than quartz.