mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale, typically white, clear, or greyish in color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Identified July 29, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, typically white, clear, or greyish in color, vitreous to greasy luster, trigonal crystal system, conchoidal fracture with no true cleavage, specific gravity of 2.65.

Formation & geological history

Formed through crystallization from silica-rich solutions or cooling magmas, later weathered from parent rock and smoothed by water transport in rivers or beaches over thousands to millions of years.

Uses & applications

Used in decorative landscaping, polished into ornamental stones, historical flint-knapping equivalents, and glass-making aggregates.

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. Commonly found in riverbeds, beaches, and glacial till worldwide.