mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified April 3, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in a wide variety of environments, most commonly from hydrothermal veins or as a constituent in igneous rocks like granite. Its white color is caused by tiny liquid or gas inclusions trapped during crystal growth.

Uses & applications

Used in glass manufacturing, as an abrasive, in the electronics industry for its piezoelectric properties, and as decorative landscaping stone or for metaphysical collecting.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While often overlooked by gem hunters, large specimens can be stunning as garden ornaments, and it is the primary source of 'gold-in-quartz' gold mining.

Field identification & locations

Identify in the field by its ability to scratch glass, its milky opaque white appearance, and its lack of cleavage (it breaks in irregular, shell-like curves). It is found globally in mountainous regions and riverbeds.