mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

Typically white to translucent with a vitreous-to-waxy luster; Mohs hardness 7, no true cleavage, conchoidal fracture, and trigonal crystal structure. The cloudy appearance comes from microscopic fluid inclusions or structural defects.

Identified August 23, 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; individual pieces may range from ancient Precambrian material to geologically young vein quartz. This specimen appears naturally broken or roughly shaped, possibly lightly polished.

Uses & applications

Used in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces are sold as inexpensive decorative or metaphysical specimens.

Geological facts

Quartz is among Earth’s most abundant minerals and is highly resistant to weathering. Milky quartz can resemble white calcite, but quartz is harder and does not fizz in dilute hydrochloric acid.

Field identification & locations

Common worldwide, including Brazil, Madagascar, the United States, and alpine vein systems. Scratch testing with a steel file is inconclusive; quartz should scratch ordinary glass but not be scratched by a steel knife.