mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale; Color: Milky white to translucent with reddish-brown iron staining; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)
- Hardness
- 7 on Mohs scale
- Color
- Milky white to translucent with reddish-brown iron staining
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent with reddish-brown iron staining; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed in hydrothermal veins or as a secondary mineral in igneous and metamorphic environments. This specimen appears water-worn, likely from a river or beach environment.
Uses & applications
Primarily collected by enthusiasts. High-purity quartz is used in glassmaking, electronics, and abrasives, though stained specimens are less desirable for industry.
Geological facts
Milkiness is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth. The reddish coloration is due to hematite or goethite (iron oxides) leaching into fractures.
Field identification & locations
Identified by its hardness (cannot be scratched by steel), waxy/glassy appearance, and lack of clear cleavage. Common in gravel beds and mountain streams worldwide.
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