mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 (Mohs), Color: Milky white to translucent, 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), Color: Milky white to translucent, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65
Formation & geological history
Forms in hydrothermal veins or as a primary constituent in igneous rocks like granite. The white color is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), jewelry, and as a decorative stone in landscaping and aquariums.
Geological facts
Milky quartz is the most common variety of crystalline quartz. While colorless quartz is 'Clear Quartz,' the 'milky' appearance comes from microscopic bubbles trapped millions of years ago.
Field identification & locations
Identify in the field by its hardness (it will scratch glass and steel), lack of cleavage, and white opaque color. It is often found in riverbeds as rounded pebbles or in mountainous outcrops.
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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