mineral

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: milky white to translucent; Luster: vitreous to greasy; Crystal structure: hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: milky white to translucent
Luster: vitreous to greasy

Identified June 26, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: milky white to translucent; Luster: vitreous to greasy; Crystal structure: hexagonal; Cleavage: none (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Forms through the cooling of silica-rich magma or from hydrothermal veins. It can be found in igneous, metamorphic, and sedimentary environments globally, dating back millions of years.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), jewelry (semi-precious gemstone), abrasives, and as a popular specimen for mineral collectors.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', and the ancient Greeks believed it was permanently frozen ice.

Field identification & locations

Identify by its hardness (it will easily scratch glass) and lack of cleavage. It is found in abundance in riverbeds, mountains, and desert sands worldwide.