mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
Hardness: 7 (Mohs), Color: Rusty brown, orange, and tan. Luster: Vitreous to dull. Crystal structure: Trigonal (often massive/fragmented in this state). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
- Hardness
- 7 (Mohs), Color: Rusty brown, orange, and tan
- Color
- Rusty brown, orange, and tan
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Mohs), Color: Rusty brown, orange, and tan. Luster: Vitreous to dull. Crystal structure: Trigonal (often massive/fragmented in this state). Cleavage: None (conchoidal fracture). Specific Gravity: 2.65.
Formation & geological history
Formed through hydrothermal processes where silica-rich fluids crystallize. The reddish/brown coloring comes from secondary groundwater infiltration or oxidation of iron-rich minerals (hematite or goethite) coating the quartz surfaces.
Uses & applications
Used primarily as rough landscaping material, decorative stones for gardeners, or as lower-tier mineral specimens for children and novice collectors. High-quality iron-stained quartz is occasionally sold as 'Golden Healer' in metaphysical markets.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Iron-staining can sometimes be removed using oxalic acid or specialized crystal cleaners to reveal clear or milky quartz underneath.
Field identification & locations
Identify in the field by its hardness (it should easily scratch glass) and its characteristic rusty coating that does not wash off with water. Commonly found in road cuts, mine tailings, and creek beds globally.
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