mineral

Quartz Grain

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Tan to translucent white; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Tan to translucent white
Luster: Vitreous to dull

Identified May 29, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Tan to translucent white; Luster: Vitreous to dull; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or precipitation from hydrothermal veins. Often found as a resistant weathered grain from igneous rocks like granite. This specimen appears to be a small clastic sediment grain.

Uses & applications

Quartz is used in glassmaking, electronics (piezoelectric properties), abrasives, and as a component in construction concrete.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which has origins in Slavic languages meaning 'hard'.

Field identification & locations

Identify in the field by its hardness (will scratch glass) and lack of cleavage. It is found globally in beaches, riverbeds, and as a primary component of many rock types.