mineral

Quartz crystal (likely milky or cloudy quartz)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Approximately 7 on the Mohs scale; colorless to white and translucent, with a vitreous luster, hexagonal crystal structure, and no true cleavage. The irregular broken-looking surfaces may indicate a small fragment rather than a complete crystal.

Identified September 8, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous or metamorphic rocks over a wide range of geological ages. This specimen may have weathered out of a quartz vein or gravel deposit.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, electronics, and engineered stone; clear, well-formed crystals are collected or used as gemstones. This small cloudy fragment has modest commercial value.

Geological facts

Quartz commonly shows conchoidal fracture and can scratch ordinary window glass and steel. Its transparency and inclusions vary with microscopic fractures, fluids, and mineral impurities.

Field identification & locations

Identify it by its glassy luster, hardness, lack of cleavage, and six-sided crystal forms when preserved; a scratch test and comparison with calcite can help. Common worldwide, especially in quartz veins, pegmatites, and alluvial gravels.