mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Milky white to translucent with iron staining (yellow/brown); 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 translucent with iron staining (yellow/brown)
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent with iron staining (yellow/brown); 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 all three rock types (igneous, metamorphic, and sedimentary) due to its chemical stability and abundance.
Uses & applications
Used as a gemstone in necklaces, as high-grade silica for electronics and glass manufacturing, and in construction as an aggregate.
Geological facts
The milky white appearance is caused by tiny inclusions of gas or liquid trapped during the crystal's formation. Quartz is the second most abundant mineral in the Earth's continental crust.
Field identification & locations
Identify by its hardness (will scratch glass), conchoidal fracture pattern, and lack of cleavage. Extremely common in river beds, beaches, and mountain trails globally.
