mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: white to translucent with reddish-brown (iron) staining; Luster: vitreous (glassy) to waxy; Crystal structure: hexagonal/trigonal; Cleavage: none (conchoidal fracture); SG: 2.65
- Hardness
- 7 on Mohs scale
- Color
- white to translucent with reddish-brown (iron) staining
- Luster
- vitreous (glassy) to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: white to translucent with reddish-brown (iron) staining; Luster: vitreous (glassy) to waxy; Crystal structure: hexagonal/trigonal; Cleavage: none (conchoidal fracture); SG: 2.65
Formation & geological history
Forms in hydrothermal veins from silica-rich fluids and as a primary mineral in igneous and metamorphic rocks. The iron staining occurs when the specimen is exposed to oxygen and water during weathering.
Uses & applications
Mainly used in glassmaking, abrasives, and as a component in construction concrete; also popular as a beginner specimen for mineral collectors.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. 'Milky' quartz gets its white color from tiny fluid inclusions of gas or liquid trapped during crystal growth.
Field identification & locations
Identify in the field by its hardness (it will scratch glass), lack of cleavage, and waxy luster. It is ubiquitous in riverbeds, mountains, and gardens worldwide.
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