mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Translucent white to milky; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Translucent white to milky
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Translucent white to milky; Luster: Vitreous to greasy; Crystal Structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65
Formation & geological history
Formed through the crystallization of silica-rich hydrothermal fluids or magma during cooling. These rounded pebbles are typically the result of fluvial erosion, where water carries and smooths the mineral over long periods.
Uses & applications
Used in glassmaking, as a source of silicon for electronics, in construction as decorative gravel, and occasionally for healing crystal practices or elementary jewelry.
Geological facts
Milky quartz gets its cloudy appearance from tiny inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz found on Earth.
Field identification & locations
Identify by its waxy luster, lack of cleavage, and ability to scratch glass. Commonly found in riverbeds, beaches, and glacial deposits worldwide.
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
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