mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous to greasy

Identified April 24, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions or magma. Milky quartz gets its cloudiness from microscopic inclusions of gas or liquid trapped during crystal growth. It can be found in igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & applications

Used in the production of glass, ceramics, and abrasives. In jewelry, it is used for beads and cabochons. It is also used as a source of silicon for semiconductors and solar panels, and globally popular for metaphysical collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often associated with gold-bearing veins in quartz-lode deposits, which historically led miners to identify it as 'bull quartz.'

Field identification & locations

Identify by its ability to scratch glass, its lack of cleavage, and its waxy/greasy luster when broken. It is extremely common in riverbeds, mountains, and beaches worldwide. Collectors should look for unique shapes or associations with other minerals.