mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale), Color: White to translucent (opaque), Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65

Identified June 12, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to translucent (opaque), Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (Conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins, pegmatites, and as a primary constituent in igneous rocks like granite. The white color is caused by microscopic fluid inclusions trapped during the crystal's rapid formation.

Uses & applications

Used as an abrasive in sandpaper, in glassmaking, as a flux in metallurgy, and as common landscaping stone or decorative rock for collectors.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. While often overlooked for clearer varieties, large masses can form entire mountain ranges and contain traces of gold.

Field identification & locations

Identify by its hardness (will scratch glass), lack of cleavage, and slightly greasy tactile feel. Commonly found in stream beds, eroded out of quartz veins in mountain ranges worldwide.