mineral

Quartz / Common Quartzite

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale; Color: Translucent white to milky or yellowish; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal in appearance); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on the Mohs scale
Color: Translucent white to milky or yellowish
Luster: Vitreous to greasy

Identified July 11, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of molten magma or from hydrothermal veins. Quartzite, its rock counterpart, is formed through the metamorphism of quartz-rich sandstone. It can be found in almost all geological environments and across all ages.

Uses & applications

Used extensively in industrial manufacturing for glass, electronics, and abrasives. In this rough form, it is mainly of interest to beginner collectors or used for landscaping and construction gravel.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is piezoelectric, meaning it generates an electric charge when mechanical stress is applied, a property used in watches and radios.

Field identification & locations

Identify by its hardness (it will easily scratch glass) and lack of cleavage. It is found globally in riverbeds, mountains, and beaches. For collectors, look for clarity or unique inclusions.