mineral
Milky Quartz
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to light gray; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Milky white to light gray
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to light gray; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
Formation & geological history
Formed in hydrothermal veins and pegmatites through the cooling of silica-rich fluids. It is found in igneous, metamorphic, and sedimentary environments globally across various geological eras.
Uses & applications
Used in glassmaking, as an abrasive, in decorative stone landscaping, as a source for silicon in electronics, and in jewelry/lapidary arts.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify in the field by its hardness (scratches glass), lack of cleavage, and waxy/vitreous luster. Common in many mountain ranges and riverbeds.
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