mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Opaque white
Luster: Vitreous to greasy

Identified June 30, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal solutions or cooling magma. Milky quartz gets its appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, as an abrasive, in electronics (though clear quartz is preferred), as a decorative stone in landscaping, and in jewelry/healing crystal markets.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many cultures for stone tools like arrowheads before the widespread use of metal.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel knife) and its white, 'milky' appearance. Commonly found in veins and pegmatites globally. It is an excellent beginner specimen due to its abundance.