mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Translucent white to pale yellowish-cream. Luster: Vitreous to greasy. Crystal structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Translucent white to pale yellowish-cream
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: Translucent white to pale yellowish-cream. Luster: Vitreous to greasy. Crystal structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
Formation & geological history
Formed in pegmatites, hydrothermal veins, and metamorphic rocks. This water-worn, smooth river pebble was tumbled naturally over time through alluvial action.
Uses & applications
Used widely in jewelry (cabochons, beads), decorative stone collections, landscaping, and industrially for silica production.
Geological facts
Milky quartz gets its cloudy appearance from tiny inclusions of gas or liquid trapped during crystal growth millions of years ago.
Field identification & locations
Identified by its ability to scratch glass (Mohs 7), lack of cleavage, and smooth rounded pebble morphology. Commonly found in riverbeds, gravel pits, and beaches worldwide.
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