Mineral

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale); Color: Creamy white to translucent; Luster: Vitreous to waxy (when river-worn); Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Creamy white to translucent
Luster: Vitreous to waxy (when river-worn)

Identified June 18, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Formed through the crystallization of molten magma or from hydrothermal veins. This specific specimen is a river-worn pebble, meaning it was detached from its source and smoothed by water erosion over thousands of years.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative gravel or landscaping stones. High-quality pieces are used in jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which has Slavic roots meaning 'hard'.

Field identification & locations

Identify in the field by its hardness (it can scratch glass and steel) and lack of cleavage. It is commonly found in riverbeds, beaches, and soil worldwide.