Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Cloudy white to tan with iron staining; 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 hydrothermal fluids or magma. Milky quartz gets its cloudiness from tiny fluid inclusions of gas or liquid trapped during crystal growth. They are found across various geological ages from Precambrian to recent.

Uses & Applications

Used in glassmaking, abrasives, electronic components (piezoelectric properties), jewelry (cabochons), and as landscaping stone.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found in nature.

Field Identification & Locations

Identify by its hardness (scratches glass), lack of cleavage, and translucent cloudy appearance. Frequently found as pebbles on beaches or in stream beds due to high resistance to weathering.

Identified on: 5/3/2026

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