mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

AI-generated identification · may be incorrect

White to translucent, vitreous-to-waxy luster with irregular fracture; Mohs hardness 7, no cleavage, trigonal crystal structure, and specific gravity about 2.65. The specimen’s rough, opaque appearance is consistent with milky quartz, though the photo alone cannot exclude white calcite or feldspar.

Identified August 24, 2026More mineral →

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Physical properties

Formation & geological history

Forms when microscopic fluid inclusions or defects cloud quartz in igneous, metamorphic, and hydrothermal veins. Quartz is common throughout Earth’s crust and may range from ancient Precambrian rocks to recent vein deposits.

Uses & applications

Used in glassmaking, ceramics, abrasives, engineered stone, and electronics; attractive pieces are collected but are usually inexpensive.

Geological facts

Quartz is one of the most abundant crustal minerals and is piezoelectric. Milky quartz commonly occurs with granite, pegmatite, and metallic-ore veins.

Field identification & locations

Check hardness: it should scratch ordinary glass and resist a steel knife; calcite fizzes in dilute acid and is much softer. Common localities include Brazil, the United States, Madagascar, and alpine mineral regions.