mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
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
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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.
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