mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

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

Identified July 8, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed via hydrothermal activity or the cooling of silica-rich magma/lava. It is the most abundant mineral on Earth's surface and can be found in variety of geological ages and environments, including veins and as a primary constituent of granites.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, as decorative stones, and in jewelry.

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 or gas trapped during crystal growth.

Field identification & locations

Identified in the field by its hardness (scratches glass), lack of cleavage, and resistance to weathering. Commonly found in riverbeds, mountains, and as gravel.