mineral

Milk Quartz (White Quartz)

Silicon Dioxide (SiO2)

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

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

Identified March 22, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The white 'milky' appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass manufacturing, as an abrasive, in electronics (due to piezoelectric properties), construction aggregates, and widely used in jewelry and lapidary as tumbled stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in the same veins as gold and is used by prospectors as a 'distinction' mineral.

Field identification & locations

Identify by its ability to scratch glass (hardness 7) and its lack of cleavage. Commonly found in riverbeds, mountains, and beaches worldwide. Collectors should look for unique shapes or clarity.