mineral

White Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, milky, or translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, milky, or translucent
Luster: Vitreous to waxy

Identified May 12, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, milky, or translucent; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as a major constituent in igneous and metamorphic rocks. This specific specimen is water-worn, indicating erosion and transport in a river or coastal environment.

Uses & applications

Used in glassmaking, as an abrasive, in electronics (due to piezoelectric properties), and as decorative landscaping or tumbled stones for collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its milky white color is often caused by tiny fluid inclusions trapped during the crystal's growth.

Field identification & locations

Identify by its hardness (it can scratch glass and steel) and lack of cleavage planes. Commonly found in river beds, beaches, and mountain trails globally.