mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified May 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica-rich magma or hydrothermal veins. The white 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. Found in almost all geological environments.

Uses & applications

Used as an abrasive, in the production of glass, ceramics, and electronics (silicon source). Often used in construction as an aggregate or for landscaping and decorative masonry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz. Some milky quartz contains traces of gold within its structure, making it a target for prospectors.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Look for it in quartz veins or as pebbles in riverbeds. It is ubiquitous globally and often found alongside granite and pegmatite deposits.