mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Identified July 9, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from cooling silica-rich hydrothermal fluids in veins or within pegmatites. The milky appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (as a source of silicon), and as decorative landscaping stone or collector specimens.

Geological facts

Quartz is one of the most abundant minerals in the Earth's crust. Milky quartz is the most common variety of crystalline quartz.

Field identification & locations

Identified by its ability to scratch glass, its lack of cleavage, and its characteristic waxy or vitreous luster. Commonly found in mountainous regions or as pebbles in river beds.