mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: Translucent white to milky; Luster: Vitreous/waxy; Crystal structure: Trigonal (microcrystalline in pebbles); Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Translucent white to milky
- Luster
- Vitreous/waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Translucent white to milky; Luster: Vitreous/waxy; Crystal structure: Trigonal (microcrystalline in pebbles); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed through hydrothermal processes in veins or as a constituent of igneous rocks. This specific specimen has been water-worn and smoothed by alluvial or coastal erosion.
Uses & applications
Used in construction aggregates, abrasive manufacturing, glassmaking, and often collected as river or beach stones.
Geological facts
The milky appearance is caused by minute fluid inclusions of gas or liquid trapped during the crystal's growth. It is the most common variety of crystalline quartz.
Field identification & locations
Identify by its hardness (will scratch glass), lack of cleavage, and smooth, waxy feel when water-worn. Common in riverbeds and on beaches worldwide.
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