mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 mohs. Color: Milky white to translucent. Luster: Vitreous/waxy. Crystal structure: Hexagonal. Cleavage: Indistinct/conchoidal fracture. Specific gravity: 2.65.
- Hardness
- 7 mohs
- Color
- Milky white to translucent
- Luster
- Vitreous/waxy
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Physical properties
Hardness: 7 mohs. Color: Milky white to translucent. Luster: Vitreous/waxy. Crystal structure: Hexagonal. Cleavage: Indistinct/conchoidal fracture. Specific gravity: 2.65.
Formation & geological history
Forms in hydrothermal veins, pegmatites, and as a primary mineral in many igneous rocks like granite. The milky appearance is caused by tiny inclusions of gas and/or liquid trapped during crystal growth.
Uses & applications
Used as an abrasive, in glass manufacturing, as a gemstone in tumbled or cabochon form, and extensively in the landscaping and construction industries.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically can contain minute amounts of gold in certain hydrothermal vein systems.
Field identification & locations
Identify by its ability to scratch glass, its lack of cleavage, and its waxy luster. It is found globally in almost all geological environments; check stream beds or mountain outcroppings.
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Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Schist
Schist
Metamorphic
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Nephrite Jade
Nephrite
Mineral/Rock
Granite
Granite (Phaneritic intrusive igneous rock)
igneous