mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness of 7 on the Mohs scale; white to grey color; vitreous to greasy luster; trigonal crystal system; conchoidal fracture with no true cleavage; specific gravity of 2.65.

Identified August 7, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale; white to grey 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 hydrothermal solutions or cooling magma, subsequently weathered, transported, and rounded by water action in streams or coastal environments.

Uses & applications

Used in glassmaking, electronics, oscillators, abrasive materials, and as a decorative stone or tumbled specimen for lapidary work.

Geological facts

Quartz is one of the most abundant minerals in the Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electrical charge under mechanical stress.

Field identification & locations

Easily identified by its high hardness (scratches glass), lack of cleavage, and conchoidal fracture. Common worldwide in stream beds, beaches, and sedimentary formations.