mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- White to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed from silica-rich hydrothermal solutions or cooling magma in veins. This specific specimen is water-worn, likely from a river or beach environment, having been tumbled over centuries.
Uses & applications
Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative aggregate in landscaping or jewelry tumbling.
Geological facts
Milky quartz gets its cloudy appearance from minute fluid inclusions of gas or liquid trapped during the crystal's growth.
Field identification & locations
Identify by its ability to scratch glass and lack of cleavage. Look for it in gravel pits, mountain streams, and along coastlines globally.
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Banded Gneiss (River Rock/Pebble)
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