mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7.0 on Mohs scale; Color: White to creamy tan; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Hardness: 7
Color: White to creamy tan
Luster: Vitreous to greasy

Identified July 1, 2026More mineral →

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Physical properties

Hardness: 7.0 on Mohs scale; Color: White to creamy tan; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65.

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or pegmatites. This specific specimen has been water-worn and smoothed by erosion in a river, stream, or beach environment.

Uses & applications

Used as an abrasive, in glass making, as a source of silicon for electronics, in landscaping, and as a decorative garden stone cycle.

Geological facts

The 'milky' appearance is caused by tiny fluid inclusions of gas or liquid trapped during the crystal's growth. It is one of the most common minerals on Earth's crust.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its smooth, waxy surface when water-worn. Common in gravel pits and riverbeds worldwide.