mineral
Quartz with Iron Oxide Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite coatings
AI-generated identification · may be incorrectHardness: 7 on Mohs scale. Color: Translucent grayish-white to tan, coated with yellowish-orange to brown iron oxides. Luster: Vitreous to greasy. Crystal structure: Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale. Color: Translucent grayish-white to tan, coated with yellowish-orange to brown iron oxides. Luster: Vitreous to greasy. Crystal structure: Trigonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids precipitated in rock fractures or cavities, later exposed to weathering and iron-rich groundwater that deposited iron oxides (limonite/hematite) on the surface.
Uses & applications
Primarily collected as a raw mineral specimen. High-grade clean quartz is used in electronics, optics, and glassmaking, while rough coated specimens are popular for amateur rockhounding.
Geological facts
Iron oxide coatings give many quartz crystals a golden, rust, or orange hue, often sold under trade names like 'Tangerine Quartz' or 'Golden Healer' depending on the depth and color of the coating.
Field identification & locations
Can be identified in the field by its scratch resistance (scratches glass easily, hard to scratch with steel), conchoidal fracture where exposed, and distinct yellowish-rust earthy coating. Commonly found in granite pegmatites, hydrothermal veins, and stream beds.
