mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous/waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous/waxy

Identified July 10, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous/waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal fluids or within igneous and metamorphic rocks. This specific specimen appears to be a water-worn river pebble, shaped by erosion over thousands of years.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as construction aggregate. Smooth pebbles are also popular for landscaping and aquarium decor.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. White quartz is often called 'Milky Quartz' due to microscopic fluid inclusions trapped during crystal growth.

Field identification & locations

Identify in the field by its hardness (it can scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and soil worldwide. It is a 'pathfinder' mineral for various ores.