mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: White to cream with orange/brown iron staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture)
- Hardness
- 7 on Mohs scale
- Color
- White to cream with orange/brown iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale; Color: White to cream with orange/brown iron staining; Luster: Vitreous to waxy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed in hydrothermal veins or as a primary constituent of igneous rocks like granite. The white color is caused by microscopic fluid inclusions trapped during crystal growth, while the orange tints are from iron oxide (limonite or hematite) leaching into fractures.
Uses & applications
Used widely in decorative landscaping, as tumbled stones for healing or collecting, and industrially as a source of silica for glass and electronics.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in massive form rather than distinct crystals when it cools rapidly in large veins.
Field identification & locations
Identify by its hardness (it will scratch glass), lack of cleavage, and common occurrence in riverbeds or mountain trails. This specimen appears water-worn or tumbled.
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Mineral
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Mineral/Rock
Granite
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