mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Identified June 30, 2026More mineral →

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Physical properties

Hardness: 7 (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 magma or from hydrothermal veins. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can be found in various geological ages and environments, particularly in igneous or metamorphic host rocks.

Uses & applications

Used in the production of glass, ceramics, and electronics (as a source of silica). Also used as an abrasive, in construction as aggregate, and in landscaping or jewelry as tumbled stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz and often occurs in massive forms as 'vein quartz'.

Field identification & locations

Identify in the field by its hardness (will scratch glass), white color, and the lack of cleavage planes. Found globally in mountains, riverbeds, and beaches. Collectors should look for distinct crystalline faces or associated minerals like gold or pyrite within the veins.