mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

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

Hardness: 7 Mohs
Color: Opaque white to milky
Luster: Vitreous to greasy

Identified June 1, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins and pegmatites. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can be found in almost all geological environments and ages.

Uses & applications

Used in glass making, ceramics, as a source for silicon, and in jewelry as cabochons or beads. Also used extensively in construction as aggregate.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in gold-bearing veins and served as a historical indicator for prospectors.

Field identification & locations

Identify by its hardness (scratches glass), white milky color, and lack of cleavage. It is found globally in many rock types including granite and sandstone.