mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs scale), Color: White to cloudy, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs scale), Color: White to cloudy, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed through the crystallization of magma or from hydrothermal solutions. The cloudy white appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. They are found in volcanic, sedimentary, and metamorphic environments.
Uses & applications
Used as a source of silica for glassmaking, abrasives, in electronics for its piezoelectric properties, and as a decorative stone in landscaping or jewelry.
Geological facts
Quartz is one of the most abundant minerals in the Earth's continental crust. Milky quartz can often occur in massive veins that carry precious metals like gold.
Field identification & locations
Identify in the field by its hardness (it will scratch glass), white cloudy color, and lack of cleavage (it breaks with curved, glass-like surfaces). Found globally in gravel pits and mountain veins.
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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