mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

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

Identified April 10, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (Trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich molten rock (magma) or hydrothermal veins. It can occur in varying geological environments and is a major constituent of the Earth's crust across all geological ages.

Uses & applications

Used in the production of glass, ceramics, and electronics (due to piezoelectric properties). Often used in construction as an aggregate and in jewelry or as decorative carvings.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its characteristic white color from microscopic inclusions of fluids trapped during crystal growth.

Field identification & locations

Identify by its hardness (it will scratch glass and steel), lack of cleavage, and translucent white appearance. It is found globally, particularly in mountains, riverbeds, and as veins in metamorphic and igneous rocks.