mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs), Color: White/Opaque, Luster: Vitreous to Greasy, Crystal Structure: Trigonal/Hexagonal, Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: White/Opaque, Luster: Vitreous to Greasy, Crystal Structure: Trigonal/Hexagonal, Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins, pegmatites, and through the cooling of silica-rich magma or precipitation from silica-rich fluids over millions of years.
Uses & applications
Used in construction as crushed stone, in glass manufacturing, as a gemstone (tumbled or focal), and as an abrasive in industrial applications.
Geological facts
The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz on Earth.
Field identification & locations
Identified by its white opacity, lack of cleavage, and ability to scratch glass. Found globally in almost every geological environment, especially in mountain ranges.
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Other mineral specimens
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