mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to translucent with iron and manganese staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Color
- Milky white to translucent with iron and manganese staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent with iron and manganese staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Forms in hydrothermal veins or as a primary constituent of igneous rocks. This specimen appears water-worn and polished, likely transported and shaped by river or glacial action.
Uses & applications
Used in jewelry (especially when tumbled), decorative landscaping, and as a source of silica in glassmaking and electronics.
Geological facts
Milkiness is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz found on Earth's crust.
Field identification & locations
Identify by its hardness (it will scratch glass), waxy luster when wet, and lack of cleavage. Common in riverbeds and coastal areas globally.
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