mineral
Milky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
Hardness: 7 (Mohs scale); Color: White, reddish-brown, and black; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
- Hardness
- 7 (Mohs scale)
- Color
- White, reddish-brown, and black
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White, reddish-brown, and black; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.
Formation & geological history
Formed from silica-rich hydrothermal fluids cooling in veins or cavities. The reddish-brown and black patches are inclusions of hematite or goethite, likely formed during the Precambrian to Holocene eras.
Uses & applications
Commonly used for lapidary work (cabochons, beads), decorative garden stones, and as metaphysical or pocket stones for collectors.
Geological facts
Quartz is one of the most abundant minerals in Earth's crust. When hematite is present in large amounts during growth, it can create 'Red Quartz' or 'Fire Quartz'.
Field identification & locations
Identify in the field by its hardness (it will scratch glass), lack of cleavage, and the contrast between the opaque white quartz and the earthy staining. Found globally in riverbeds, mountains, and mines.
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