mineral

Milky quartz (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Typically Mohs hardness 7, white to translucent, with a vitreous to waxy luster and no cleavage; it commonly shows irregular conchoidal fracture. The specimen appears rough, pale cream, and partly translucent, though lighting makes exact identification uncertain.

Identified August 15, 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; quartz is common from Precambrian to modern geological settings. Its cloudy appearance generally comes from microscopic fluid inclusions or fractures.

Uses & applications

Used extensively in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces are sold as inexpensive specimens. Estimated value: about $2–$15 for a small common fragment, more if crystals or locality are exceptional.

Geological facts

Quartz is one of Earth’s most abundant minerals and is piezoelectric. Milky quartz can resemble calcite, feldspar, or pale chalcedony.

Field identification & locations

Field tests include its ability to scratch ordinary glass and its lack of reaction to dilute hydrochloric acid, unlike calcite; inspect for hexagonal crystal faces if present. Common worldwide, especially in hydrothermal veins and granitic terrains.