mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster, irregular fracture, and no obvious cleavage; Mohs hardness 7 and specific gravity about 2.65. The rough, granular appearance may indicate quartz intergrown with minor feldspar or clay, so exact identification from one photograph is provisional.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids crystallize in veins, cavities, and igneous rocks; it can also occur as a metamorphic or sedimentary component. Quartz is geologically widespread from Precambrian rocks to the present day.

Uses & applications

Used in glass, ceramics, foundry sand, electronics, abrasives, and construction aggregate; attractive pieces are collected or occasionally cut as low-cost cabochons.

Geological facts

Milky color results mainly from microscopic fluid inclusions, fractures, or defects scattering light. Quartz is commonly mistaken for calcite or feldspar; a steel file should not scratch it, while quartz can scratch ordinary glass.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and alpine and hydrothermal vein districts. Confirm with hardness, lack of cleavage, and a streak test; calcite fizzes in dilute acid but quartz does not.