mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Hardness: 7 on Mohs scale
Color: White to tan/creamy
Luster: Vitreous to greasy

Identified June 10, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins or as a late-stage crystallization in igneous rocks like granite. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used as a source of silicon for semiconductors, high-end construction aggregates, glass making, and as decorative landscaping stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically gets its color from 'fluid inclusions,' which are microscopic bubbles of water or CO2.

Field identification & locations

Identify in the field by its inability to be scratched by a steel knife (hardness 7) and its lack of cleavage planes. Found globally in almost all geological environments.