mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous (glassy) to greasy

Identified February 14, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of magma or hydrothermal activity in veins. It is one of the most abundant minerals in the Earth's crust, found in igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & applications

Used in glassmaking, abrasives, foundry sand, and as a gemstone for jewelry (tumbled stones). In industry, it is a source of silicon for electronics and solar panels.

Geological facts

The milky white color is caused by tiny fluid inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and common occurrence in veins. Found globally, especially in mountain ranges and riverbeds. Collectors look for pieces with distinct hexagonal crystal points.

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