mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to waxy (when weathered); 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 waxy (when weathered)

Identified March 7, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins or from the crystallization of pegmatites. This specific specimen has been secondary-processed by water erosion (stream or beach action) to create its smooth, rounded 'pebble' shape.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), abrasives, and as decorative landscaping stone. Tumbled pieces are popular for beginner rock collections and metaphysical uses.

Geological facts

Milky quartz gets its white, cloudy appearance from tiny inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz found on Earth's surface.

Field identification & locations

Identify in the field by its hardness (it will easily scratch glass) and its lack of cleavage. It is commonly found in riverbeds, beaches, and glacial till globally. Collectors should look for internal 'fires' or clarity in thicker sections.