mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

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

Identified June 28, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed in hydrothermal veins or as a primary constituent in igneous rocks like granite. This specific specimen is likely a water-worn river pebble, shaped by erosion over thousands to millions of years.

Uses & applications

Used extensively in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative landscaping stone. Also popular in gemstone carving and metaphysical collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's formation.

Field identification & locations

Identified in the field by its hardness (it will scratch glass), lack of cleavage, and white waxy appearance. Commonly found in riverbeds, beaches, and mountain trails globally.