mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified May 10, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in hydrothermal veins or pegmatites when silica-rich solutions cool down. The white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass making, ceramics, as an abrasive, in electronics (due to piezoelectric properties), and as decorative landscaping stone or low-cost crystals for collectors.

Geological facts

Milky quartz is the most common variety of crystalline quartz on Earth. Its waxy appearance often leads beginners to confuse it with white marble or chalcedony.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage (breaks like glass). It is found globally in almost any environment including riverbeds, mountains, and deserts.