Quartz Vein / Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to pale tan; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & Geological History

Formed from hydrothermal solutions precipitating in rock fractures. Quartz is one of the most abundant minerals and can form in igneous, metamorphic, and sedimentary environments throughout geological time.

Uses & Applications

Used widely in glass making, electronics (piezoelectric properties), abrasives, and as a component in construction concrete.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. 'Milky quartz' gets its white appearance from microscopic fluid inclusions trapped during the crystal's growth.

Field Identification & Locations

Identify in the field by its inability to be scratched by a steel knife and its lack of cleavage. It often appears as white 'veins' cutting through darker host rocks.

Identified on: 4/13/2026

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