mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal system); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous to greasy

Identified June 19, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal system); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent of igneous rocks like granite. The milky appearance is caused by tiny liquid or gas inclusions trapped during crystal growth.

Uses & applications

Used in the production of glass, ceramics, and electronics (as a source of silicon); also used in abrasive blasting, landscaping, and as a semi-precious gemstone in jewelry or for decorative carvings.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. Milky quartz specifically gets its color from microscopic bubbles of water or CO2 that scatter light, similar to how clouds appear white.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and white waxy appearance. Commonly found in riverbeds, mountains, and beaches worldwide. Collectors look for large, well-formed hexagonal crystals.