mineral
Milky Quartz
Quartz (SiO2)
Mohs hardness: 7; Color: Milky white to yellowish; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.
- Hardness
- 7
- Color
- Milky white to yellowish
- Luster
- Vitreous to greasy
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Physical properties
Mohs hardness: 7; Color: Milky white to yellowish; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.
Formation & geological history
Formed during the final stages of magma cooling in hydrothermal veins or pegmatites. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in glassmaking, abrasives, electronics (piezoelectric properties), and frequently as a landscaping stone or in jewelry as cabochons.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically gets its cloudiness from fluid inclusions that were present during its formation millions of years ago.
Field identification & locations
Identified by its hardness (scratches glass), lack of cleavage, and translucent white color. It is extremely common in gravel pits, mountain ranges, and near volcanic sites worldwide.
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock
Banded Gneiss (River Rock/Pebble)
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