mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale), Color: White to translucent yellowish-tan, Luster: Vitreous (glassy) to waxy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified April 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The 'milky' appearance is caused by tiny fluid or gas inclusions trapped during crystal growth. They are found across all geological ages.

Uses & applications

Used in glassmaking, abrasives, and as a component in construction concrete. Also used for metaphysical purposes, garden landscaping, and as a starter mineral for collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz. Some milky quartz contains inclusions of gold or other precious metals.

Field identification & locations

Identify by its hardness (it will scratch glass), lack of cleavage, and waxy luster. Commonly found in riverbeds, mountain ranges, and as pebbles in gravel. It is highly resistant to weathering.