mineral
Milky Quartz
Quartz (SiO2)
Hardness: 7 (Mohs), Color: White to translucent, Luster: Vitreous/greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
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Physical properties
Hardness: 7 (Mohs), Color: White to translucent, Luster: Vitreous/greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Formed in hydrothermal veins, pegmatites, and as a primary mineral in igneous, metamorphic, and sedimentary environments. Many milky quartz specimens contain microscopic fluid inclusions that give them their cloudy appearance.
Uses & applications
Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and as decorative gravel or gemstone cabochons.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz's white color is actually caused by tiny gas or liquid bubbles trapped during the crystal's growth.
Field identification & locations
Identified by its hardness (scratches glass), white color, and lack of cleavage. It is ubiquitous in most geological environments worldwide, often appearing as veins in darker rock.
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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