mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Opaque white to light gray with brown/yellow iron staining; Luster: Vitreous to greasy; Crystal structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Opaque white to light gray with brown/yellow iron staining
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Opaque white to light gray with brown/yellow iron staining; Luster: Vitreous to greasy; Crystal structure: Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed through the cooling of silica-rich hydrothermal fluids in veins or pegmatites. The milky appearance is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.
Uses & applications
Used in the production of glass, ceramics, and as an abrasive. Also used in construction aggregate and as decorative landscaping stones.
Geological facts
Milky quartz is the most common variety of crystalline quartz. Historically, it has been used for various stone tools due to its hardness and chip patterns.
Field identification & locations
Identify in the field by its white color, inability to be scratched by a steel knife, and lack of cleavage (breaks like glass). Commonly found in mountain ranges and riverbeds worldwide.
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