mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

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

Identified July 21, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins or as a late-stage mineral in igneous pegmatites. The white color is caused by microscopic inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, as an abrasive, in electronics for its piezoelectric properties, and commonly as decorative landscaping stone or tumbled pocket stones.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. It is often found in large veins that can be several meters wide, cutting through other rock types.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and white 'milky' appearance. Found globally, especially in mountain ranges and riverbeds.