mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 Mohs scale; Color: Milky white with iron oxide staining (brownish-orange); Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 Mohs scale
- Color
- Milky white with iron oxide staining (brownish-orange)
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 Mohs scale; Color: Milky white with iron oxide staining (brownish-orange); Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Forms through the crystallization of silica-rich hydrothermal fluids in veins or geothermal environments. It is often found as hydrothermal vein filling in igneous and metamorphic rocks.
Uses & applications
Used as a source of silicon for semiconductors, glass making, abrasives, and as decorative stone in landscaping or lapidary arts.
Geological facts
The milky appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth. It is one of the most common minerals on the Earth's crust.
Field identification & locations
Identified in the field by its hardness (scratches glass), lack of cleavage, and white-to-stained appearance. Highly common in mountain streams and gold-bearing regions.
