mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Tan, beige, translucent white; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Tan, beige, translucent white
Luster: Vitreous to waxy

Identified May 28, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Tan, beige, translucent white; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids or magma, or as a secondary mineral in sedimentary environments. This specific specimen appears to be water-worn by alluvial or coastal processes.

Uses & applications

Common quartz is used in construction (sand), glass making, electronics (semiconductors), and as an abrasive. Smooth pebbles are often used for decorative landscaping or aquarium gravel.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is chemically very stable, which is why it often remains as pebbles while softer minerals erode away.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Found globally in river beds, beaches, and soil. To collectors, this is a common 'river rock'.