mineral
Milky Quartz
Silicon dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Opaque white to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65
Formation & geological history
Formed through the cooling of silica-rich magma or from hydrothermal veins. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. They can be found in a wide variety of geological ages.
Uses & applications
Used in glassmaking, as an abrasive, in the production of silicon, and commonly as decorative landscaping stone or as a collector's mineral.
Geological facts
Milky quartz is the most common variety of crystalline quartz. It is often found in massive form rather than as distinct crystals. In gold-mining regions, milky quartz veins are a primary indicator of potential gold deposits.
Field identification & locations
Identify in the field by its hardness (will scratch glass), white opaque color, and lack of cleavage. It is found globally in igneous, metamorphic, and sedimentary environments.
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Schist
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Metamorphic
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic