mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: White, cloudy, or translucent
Luster: Vitreous to greasy

Identified June 24, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in hydrothermal veins, pegmatites, and as a primary constituent of granites. The 'milky' appearance is caused by tiny gas or fluid bubbles trapped during crystal growth.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as a decorative stone in landscaping and inexpensive jewelry/collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in the same veins as gold and often signifies a good place for prospecting.

Field identification & locations

Look for a glassy white appearance with no cleavage planes; it will scratch glass easily. Commonly found in riverbeds, mountain ranges, and rocky outcrops worldwide.