mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Identified April 5, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a late-stage mineral in igneous rocks like granite. Its cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass manufacturing, as an abrasive, in electronics (due to piezoelectric properties), for decorative landscaping, and occasionally as a semi-precious gemstone or in metaphysical collections.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. Historically, it was used to make stone tools by early humans where chert and flint were unavailable.

Field identification & locations

Identify in the field by its hardness (it can scratch glass), white milky color, and lack of cleavage. It is found globally in many different geological environments.