mineral

Quartz (Common Grains)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, translucent, or colorless; Luster: Vitreous/glassy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, translucent, or colorless
Luster: Vitreous/glassy

Identified June 2, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, translucent, or colorless; Luster: Vitreous/glassy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Forms in a wide variety of environments, primarily through the cooling of silica-rich magma or through hydrothermal vein deposits. These specific grains appear to be weathered fragments or aquarium/construction grit.

Uses & applications

Used extensively in the manufacture of glass, electronics (piezoelectric properties), abrasives, and as a component in concrete and mortar.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is chemically and physically resistant to weathering, which is why it is the primary component of most beach sand.

Field identification & locations

Identify in the field by its hardness (it will scratch glass) and lack of cleavage. Look for a glassy luster and hexagonal crystal habit in larger specimens.