mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

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

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

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

Uses & applications

Used in landscaping, as a source of silicon for electronics, in glassmaking, and occasionally for lapidary work or as decorative garden stones.

Geological facts

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

Field identification & locations

Identify by its hardness (it will scratch glass), lack of cleavage, and white waxy appearance. Commonly found in riverbeds, beaches, and glacial deposits worldwide.