mineral
Milky Quartz
Silicon Dioxide (SiO2)
White to cloudy translucent color, vitreous luster, Mohs hardness of 7, trigonal crystal system, conchoidal fracture (no cleavage), specific gravity of 2.65.
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Physical properties
White to cloudy translucent color, vitreous luster, Mohs hardness of 7, trigonal crystal system, conchoidal fracture (no cleavage), specific gravity of 2.65.
Formation & geological history
Formed from hydrothermal solutions or igneous cooling primarily in veins and pegmatites. It is one of the most common minerals in the Earth's crust across all geological eras.
Uses & applications
Used in glassmaking, abrasives, jewelry (tumbled stones), and as a structural gemstone. Also important in the production of silicon for electronics.
Geological facts
The milky appearance is caused by microscopic inclusions of gas or liquid trapped during the crystal's formation. It is often found in large, vein-filling masses.
Field identification & locations
Identify by its hardness (will scratch glass but not be scratched by a steel file), white color, and waxy to vitreous luster. Found globally, especially in mountain ranges and stream beds.
More like this
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