mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous to waxy

Identified May 9, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of magma or through hydrothermal precipitation in veins. This specific specimen has been Rounded and smoothed by water erosion in a river or coastal environment.

Uses & applications

Commonly used as abrasive material, in construction gravel, as a source for silicon, and as decorative garden stones. High-quality quartz is used in electronics and optics.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which originally meant 'hard'. Due to its durability, it often outlasts other minerals in the weathering process.

Field identification & locations

Identified by its hardness (it can scratch glass), lack of cleavage, and smooth, rounded surface from water-wear. Found globally in riverbeds, beaches, and glacial deposits.