mineral
Milky Quartz
Silicon Dioxide (SiO2)
Mohs hardness of 7, white to cloudy translucent color, vitreous luster, hexagonal crystal system, conchoidal fracture (no cleavage), specific gravity 2.65
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Physical properties
Mohs hardness of 7, white to cloudy translucent color, vitreous luster, hexagonal crystal system, conchoidal fracture (no cleavage), specific gravity 2.65
Formation & geological history
Formed in hydrothermal veins or igneous pegmatites. The cloudy appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth millions of years ago.
Uses & applications
Used in glassmaking, abrasives, silicon production for electronics, and as a landscaping or decorative stone.
Geological facts
Quartz is the most abundant mineral found at Earth's surface. Milky quartz specifically gets its appearance from 'fluid inclusions' of water or CO2.
Field identification & locations
Identify in the field by its hardness (it can scratch glass), lack of cleavage, and typical cloudy white appearance. It is extremely common in metamorphic and igneous terrains.
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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