mineral
Milky Quartz
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Cloudy white to grayish; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Cloudy white to grayish
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Cloudy white to grayish; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.
Formation & geological history
Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a major constituent of igneous rocks like granite. The milky appearance is caused by tiny liquid or gas inclusions trapped during crystal growth.
Uses & applications
Used in the production of glass, ceramics, and electronics (due to piezoelectric properties). Often used as a landscaping decorative stone or for lapidary work like cabochons.
Geological facts
Quartz is the most abundant mineral in the Earth's crust. Milky quartz is a common variety and can often be found as 'river rocks' due to its high resistance to weathering.
Field identification & locations
Identify by its ability to scratch glass, its waxy to vitreous luster, and lack of cleavage planes. Commonly found in riverbeds, mountain ranges, and sedimentary gravel deposits globally.
