mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 on Mohs scale
- Color
- Opaque white to translucent
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed during the late stages of hydrothermal or pegmatitic igneous activity as silica-rich fluids cool in veins or crustal pockets. Can be found in geological environments ranging from Precambrian to Cenozoic eras.
Uses & applications
Used in the manufacturing of optical instruments, electronics (oscillators), glassmaking, as an abrasive, and widely used in landscaping and crystal collecting.
Geological facts
Milkiness is caused by tiny liquid or gas bubble inclusions trapped during the crystal's growth. It is the most common variety of crystalline quartz on Earth.
Field identification & locations
Identify in the field by its white color, ability to scratch glass, and lack of cleavage (breaks like glass). Commonly found in quartz veins and within granite batholiths worldwide.
