mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on the Mohs scale, Color: White to translucent, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified August 5, 2026More mineral →

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Physical properties

Hardness: 7 on the Mohs scale, Color: White to translucent, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Formed through the weathering and water-transport of quartz-rich rocks (such as granite or quartzite) in rivers, beaches, or glacial environments.

Uses & applications

Used in landscaping, aggregate, glassmaking, and occasionally as a tumbling or decorative stone.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust and is exceptionally resistant to weathering, which is why quartz pebbles are extremely common in riverbeds and on beaches.

Field identification & locations

Can be identified by its high hardness (scratches glass), lack of cleavage, and resistance to acid. Found worldwide in nearly all geological environments.