mineral

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to translucent, with a vitreous-to-waxy luster and massive, non-cleavable crystal structure; fracture is uneven to conchoidal. The specimen appears weathered and granular, possibly with minor iron staining or attached matrix.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallizes from silica-rich hydrothermal fluids, pegmatites, and igneous or metamorphic rocks; individual crystals may form across a wide range of geological ages. This rough piece likely represents massive vein quartz or quartz-rich rock.

Uses & applications

Used in glassmaking, ceramics, engineered stone, electronics, abrasives, and construction aggregate; attractive pieces are collected or cut for cabochons. Common rough specimens generally have modest commercial value.

Geological facts

Quartz is one of Earth’s most abundant minerals and is the defining mineral of many veins and sandstones. Its lack of cleavage and high hardness distinguish it from calcite and feldspar.

Field identification & locations

Look for glassy luster, hardness sufficient to scratch ordinary glass, and no true cleavage; a streak test is white. Common worldwide, especially in hydrothermal veins, pegmatites, and metamorphic terrains.