mineral

Quartz Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on the Mohs scale. Color: White, milky, or off-white. Luster: Vitreous to greasy. Crystal structure: Trigonal. Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.65.

Hardness: 7 on the Mohs scale
Color: White, milky, or off-white
Luster: Vitreous to greasy

Identified August 5, 2026More mineral →

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Physical properties

Hardness: 7 on the Mohs scale. Color: White, milky, or off-white. Luster: Vitreous to greasy. Crystal structure: Trigonal. Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.65.

Formation & geological history

Formed through the crystallization of silica-rich solutions or cooling magma, subsequently weathered, eroded, and rounded by water transport in rivers or beaches over thousands to millions of years.

Uses & applications

Used in landscaping, decorative stone, abrasive manufacturing, glass production, and occasionally lapidary work.

Geological facts

Quartz is one of the most abundant and durable minerals in the Earth's continental crust, highly resistant to both chemical and physical weathering.

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and resistance to weathering. Found worldwide in stream beds, beaches, and sedimentary deposits.