mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to creamy tan; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (often massive); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to creamy tan
Luster: Vitreous to waxy

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through 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 fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used as a gemstone in tumbled form, as a source of silicon for electronics, in glassmaking, and extensively as a construction aggregate and landscaping stone.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it has been used by various cultures to make tools like scrapers and arrowheads due to its hardness and sharp edges when fractured.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its waxy white appearance. It is found globally in almost any geological environment, particularly in mountain ranges and stream beds.