mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to creamy tan; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Opaque white to creamy tan
Luster: Vitreous to greasy

Identified June 2, 2026More mineral →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to creamy tan; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a primary constituent in igneous rocks like granite. This specific specimen has been smoothed by water erosion in a fluvial or beach environment.

Uses & applications

Used in the manufacturing of glass and ceramics, as an abrasive, in landscaping, and occasionally as a semi-precious gemstone for decorative carvings or tumbled stones.

Geological facts

Milky quartz gets its characteristic white color from microscopic inclusions of fluids or gases trapped during the crystal's growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify by its ability to scratch glass, its waxy white appearance, and lack of cleavage planes. Commonly found in riverbeds, glacial deposits, and gravel pits globally.