mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

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

Identified July 13, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Cloudy white to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (Conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed during the late stages of hydrothermal activity in igneous and metamorphic environments. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used for architectural stone, jewelry (tumbled stones, beads), abrasive manufacturing, and as a source of silica for glass and ceramics.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. It is often found in large veins that cut across other rock types and can be a host rock for gold.

Field identification & locations

Identifiable by its white color, hardness (it can scratch glass), and lack of cleavage. It is found globally, particularly in areas with granitic pegmatites or metamorphic veins.