mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale. Color: Translucent white to milky white. Luster: Vitreous to greasy. Crystal System: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.

Hardness: 7 on Mohs scale
Color: Translucent white to milky white
Luster: Vitreous to greasy

Identified July 24, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale. Color: Translucent white to milky white. Luster: Vitreous to greasy. Crystal System: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.

Formation & geological history

Formed from hydrothermal veins and igneous intrusions, subsequently eroded, rounded, and smoothed by water transport in rivers, stream beds, or ocean beaches.

Uses & applications

Commonly collected as river rocks or beach stones; used in landscaping, glassmaking, electronics, abrasive applications, and decorative gemstone crafts.

Geological facts

Milky quartz gets its cloudy white appearance from tiny fluid inclusions of gas or liquids trapped inside the crystal structure during its initial growth.

Field identification & locations

Identified by its scratch resistance (scratches glass and steel), lack of cleavage, and smooth, water-worn texture. Found abundantly worldwide along coastlines and gravel beds.