mineral

Milky quartz (likely quartz-rich metamorphic rock)

Quartz, silicon dioxide (SiO₂); possibly quartzite or quartz-veined rock

AI-generated identification · may be incorrect

White to translucent, vitreous-to-pearly luster, massive granular texture, and no obvious cleavage; Mohs hardness 7, with specific gravity about 2.65. The attached gray-green fragment may contain mica, feldspar, or chlorite.

Identified August 30, 2026More mineral →

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Physical properties

Formation & geological history

Quartz commonly crystallizes from silica-rich hydrothermal fluids in fractures or forms during metamorphism of sandstone; such material may range from ancient Precambrian to younger geological ages. The specimen appears naturally weathered and partly attached to a darker host rock.

Uses & applications

Used for glass, ceramics, engineered stone, abrasives, and industrial silica; attractive clear pieces are collected or cut as cabochons. This opaque specimen has modest decorative value.

Geological facts

Milky color results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify it by its white translucent appearance, glassy grains, hardness sufficient to scratch ordinary glass, and lack of cleavage; distinguish it from calcite, which is softer and reacts with dilute acid. Common in granite, metamorphic rocks, veins, and stream gravels worldwide.