mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Opaque white to cream; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Opaque white to cream
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Opaque white to cream; Luster: Vitreous to waxy; Crystal structure: Hexagonal (trigonal); Specific gravity: 2.65
Formation & geological history
Formed through the cooling of silica-rich hydrothermal fluids or magma. This specimen is a water-worn river pebble, shaped by erosion over thousands of years.
Uses & applications
Quartz is used in glassmaking, abrasives, and electronics. Small pebbles like this are often used in landscaping or as decorative aggregate.
Geological facts
The milky white color is caused by tiny inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz found on Earth's surface.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and glacial deposits worldwide.
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