mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

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

Identified July 18, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or as a constituent in igneous, metamorphic, and sedimentary rocks. Milky quartz gets its cloudiness from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass making, as an abrasive, in the production of silicon metal, as landscaping stone, and occasionally in jewelry as cabochons.

Geological facts

Quartz is the most abundant and widely distributed mineral found at Earth's surface. Milky quartz is the most common variety of crystalline quartz.

Field identification & locations

Identified in the field by its hardness (scratches glass), lack of cleavage, and white 'milky' appearance. Commonly found in gravel pits, riverbeds, and as veins in mountains.