mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to off-white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (though microcrystalline in this weathered form); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- White to off-white
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to off-white; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (though microcrystalline in this weathered form); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or pegmatites; this specific specimen has been eroded and smoothed by water over a long period, likely in a riverbed or coastal environment.
Uses & applications
Used in landscaping, glass manufacturing, electronics (due to piezoelectricity), and as a base material for various industrial abrasives.
Geological facts
Milky quartz gets its white color from tiny fluid inclusions of gas or liquid trapped during crystal growth. It is one of the most common minerals on Earth's crust.
Field identification & locations
Identified by its hardness (it can scratch glass), lacks of cleavage, and translucent white appearance. Commonly found in riverbeds, beaches, and gravel pits worldwide.
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