mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to creamy tan with iron staining; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to creamy tan with iron staining
Luster: Vitreous to waxy

Identified July 9, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to creamy tan with iron staining; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed through hydrothermal processes in veins or as a constituent in igneous and metamorphic rocks. This specific specimen has been eroded and water-worn in a river or beach environment, rounding its edges over thousands of years.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, and as decorative gravel or landscaping stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. It is highly resistant to chemical and physical weathering, which is why it is so common on beaches and in riverbeds.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. Look for the translucent quality and smooth, rounded surface typical of alluvial or beach transport. Found globally in almost every geological environment.