mineral

Milky quartz

Quartz (SiO₂), likely massive or microcrystalline quartz

AI-generated identification · may be incorrect

Mohs hardness 7; translucent white to pale tan, with a vitreous-to-waxy luster and no obvious cleavage. It has a trigonal crystal structure, conchoidal fracture, and specific gravity near 2.65.

Identified August 22, 2026More mineral →

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Physical properties

Mohs hardness 7; translucent white to pale tan, with a vitreous-to-waxy luster and no obvious cleavage. It has a trigonal crystal structure, conchoidal fracture, and specific gravity near 2.65.

Formation & geological history

Forms when silica-rich hydrothermal fluids or igneous melts crystallize in veins and cavities; the cloudy appearance results from microscopic fluid inclusions or fractures. Quartz is common from Precambrian through modern geological settings.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are collected or polished for decorative objects, though this specimen appears common and unworked.

Geological facts

Quartz is one of Earth’s most abundant minerals and is resistant to weathering, making it common in sand and sediment. The apparent tan color may come from surface staining or iron-bearing inclusions.

Field identification & locations

Identify it by its glassy appearance, lack of cleavage, conchoidal breakage, and inability to scratch with a steel knife; it can scratch ordinary glass. Common worldwide in veins, granites, pegmatites, and sedimentary deposits.