mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

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

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

Identified July 12, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from silica-rich hydrothermal solutions or the cooling of igneous magma. This specific specimen is a water-worn river or beach pebble, smoothed by mechanical erosion over thousands of years.

Uses & applications

Used in glassmaking, abrasives, landscaping, and construction. In polished form, it is used for decorative stones, meditation stones, and inexpensive jewelry.

Geological facts

Milky quartz gets its cloudy white appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth. It is one of the most common minerals found in the Earth's crust.

Field identification & locations

Identified in the field by its hardness (it will scratch glass), lack of cleavage, and white 'milky' opacity. Frequently found in riverbeds, glacial deposits, and mountain streams worldwide.