mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 Mohs; Color: White to cloudy; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65
- Hardness
- 7 Mohs
- Color
- White to cloudy
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 Mohs; Color: White to cloudy; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct; Specific Gravity: 2.65
Formation & geological history
Forms primarily from hydrothermal veins and within igneous pegmatites. The milky appearance is caused by tiny liquid or gas inclusions trapped during crystal growth.
Uses & applications
Used as an abrasive, in glass making, as a gemstone (cabochons), and as a decorative stone in landscaping and aquariums.
Geological facts
Milky quartz is the most common variety of crystalline quartz. It is often found associated with gold in hydrothermal vein deposits.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and white opaque color. Found globally in almost all geological environments.
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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
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety often found as a river rock)
Metamorphic Rock