mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
Hardness: 7 on Mohs scale; Color: Opaque white with reddish-brown staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal (Hexagonal); Cleavage: None/Conchoidal fracture.
- Hardness
- 7 on Mohs scale
- Color
- Opaque white with reddish-brown staining
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Opaque white with reddish-brown staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal (Hexagonal); Cleavage: None/Conchoidal fracture.
Formation & geological history
Formed in hydrothermal veins or pegmatites from cooling silica-rich fluids. The red/brown bands are caused by the oxidation of iron-bearing minerals (like hematite or goethite) that seeped into fractures in the quartz.
Uses & applications
Primarily used as a decorative specimen, in landscaping, or as a source of silica in glassmaking and electronics.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. These specific specimens are often called 'Iron Quartz' or 'Hematoid Quartz' when the staining is deep red.
Field identification & locations
Identified in the field by its hardness (ability to scratch glass), lack of cleavage, and characteristic white-to-stained appearance. Commonly found in riverbeds and mountainous terrain globally.
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