Milky Quartz

Physical Properties

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

Formation & Geological History

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. Milky quartz gets its cloudiness from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & Applications

Used in glass making, abrasives, gemstones (cabochons), and as a source of silicon for electronic components. Often used in landscaping and construction aggregates.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by millions of microscopic bubbles that scatter light within the crystal.

Field Identification & Locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and white cloudy appearance. It is extremely common in pegmatites and hydrothermal veins worldwide.

Identified on: 5/15/2026

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