mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

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 March 29, 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

Formed from cooling hydrothermal veins or magma in various igneous and metamorphic environments. This specimen appears to be a water-worn or tumbled pebble.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative stones or pocket pebbles in the lapidary trade.

Geological facts

The milky appearance is caused by tiny inclusions of liquid or gas trapped during the crystal's growth. It is the most common variety of crystalline quartz found on Earth.

Field identification & locations

Identify by its white opaque color and inability to be scratched by a steel knife. Commonly found in riverbeds, beaches, and quartz veins globally. Collectors look for high translucency or unique shapes.