mineral
Ferruginous Quartz
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
Hardness: 7 (Mohs scale), Color: White to translucent with orange/red staining, Luster: Vitreous (glassy), Crystal Structure: Hexagonal (Trigonal), Cleavage: None (conchoidal fracture)
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Physical properties
Hardness: 7 (Mohs scale), Color: White to translucent with orange/red staining, Luster: Vitreous (glassy), Crystal Structure: Hexagonal (Trigonal), Cleavage: None (conchoidal fracture)
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids cool in veins. The red/orange coloration comes from iron oxide (hematite or limonite) staining within fractures or included during formation.
Uses & applications
Used primarily in lapidary work, landscaping, and by crystal collectors for aesthetic and metaphysical purposes.
Geological facts
Also known as Hematoid Quartz, this specimen combines the stability of quartz with the grounding properties of iron minerals. The 'rust' color is often superficial but can penetrate deep into the crystalline structure.
Field identification & locations
Identify in the field by its high hardness (cannot be scratched by a steel knife) and its distinct waxy to glassy appearance despite the iron staining. Extremely common in many geological environments globally.
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