mineral
Milky Quartz
SiO2 (Silicon Dioxide)
Hardness: 7 on Mohs scale. Color: White, opaque to translucent. Luster: Vitreous to greasy. Crystal structure: Hexagonal. Cleavage: Indistinct. Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- White, opaque to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: White, opaque to translucent. Luster: Vitreous to greasy. Crystal structure: Hexagonal. Cleavage: Indistinct. Specific gravity: 2.65.
Formation & geological history
Forms in igneous, metamorphic, and sedimentary rocks. The milky color is due to microscopic fluid inclusions consisting of gas, liquid, or both, trapped during crystal formation.
Uses & applications
Used in the manufacturing of glass and ceramics, as an abrasive, and sometimes in landscaping or inexpensive jewelry.
Geological facts
Milky quartz is the most common variety of crystalline quartz. Historically, some milky quartz has contained gold-bearing veins.
Field identification & locations
Easily identified by its white color, hardness (can scratch glass), and conchoidal fracture. Commonly found worldwide.
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