mineral

Quartz pebble

Quartz (Silicon Dioxide, SiO2)

Hardness of 7 on the Mohs scale, typically white, clear, or yellowish-brown due to iron staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.

Identified July 28, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white, clear, or yellowish-brown due to iron staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65.

Formation & geological history

Formed through crystallization from silica-rich solutions or magma. This specific specimen is likely a quartz grain or pebble smoothed by water transport in a stream or beach environment over geological time.

Uses & applications

Used in landscaping, decorative gravel, glassmaking, and abrasive products. Common specimen for beginning rock collectors.

Geological facts

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

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found globally in almost all geological environments.