mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

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

Identified April 11, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich magma or precipitation from hydrothermal veins. It is found in all types of geological environments (igneous, metamorphic, and sedimentary) across all geological ages.

Uses & applications

Used in glassmaking, jewelry (as semi-precious stones), electronics (due to piezoelectric properties), abrasives, and as a common specimen for mineral collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its white color from tiny bubbles of gas or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its characteristic waxy or glassy luster. It is found globally, notably in mountainous regions and riverbeds.