mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; 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/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins or as a primary constituent in igneous rocks. This specific specimen is likely a river-worn pebble smoothed by water erosion over geological time.
Uses & applications
Used widely in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative stone in landscaping or home decor.
Geological facts
The milky white color is caused by tiny inclusions of gas or liquid trapped during the crystal's formation billions of years ago. It is one of the most abundant minerals in the Earth's crust.
Field identification & locations
Commonly found in riverbeds, beaches, and mountainous regions worldwide. Identify by its ability to scratch glass and its lack of clear cleavage planes.
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Schist
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Metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
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