mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, uneven fracture, and no obvious cleavage; Mohs hardness 7, trigonal crystal structure, and specific gravity about 2.65. The specimen appears rough and somewhat granular, possibly with minor weathering or attached matrix.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous or metamorphic rocks; its cloudy appearance results from microscopic fluid inclusions or structural defects. Quartz is common from Precambrian to modern geological settings.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive translucent pieces are collected or occasionally cut as ornamental material. This small rough specimen has modest commercial value.

Geological facts

Milky quartz is among the most abundant quartz varieties and can occur with crystals of amethyst, feldspar, or sulfide minerals. Its hardness allows it to scratch ordinary glass and steel.

Field identification & locations

Identify it by its white translucency, glassy sheen, hardness, and lack of cleavage; a steel file should not easily scratch it, while it can scratch glass. Common worldwide, especially in hydrothermal quartz veins and granitic or metamorphic terrains.