mineral
Ferruginous Quartz
Iron-stained Quartz (SiO2 with Fe2O3 impurities)
AI-generated identification · may be incorrectHardness: 7 (Mohs scale); Color: Yellow, orange, rusty brown, to dull white; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal (though often massive/river-worn); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
- Hardness
- 7 (Mohs scale)
- Color
- Yellow, orange, rusty brown, to dull white
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 (Mohs scale); Color: Yellow, orange, rusty brown, to dull white; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal (though often massive/river-worn); Cleavage: None/Conchoidal fracture; Specific gravity: 2.65
Formation & geological history
Formed through hydrothermal processes or within metamorphic veins. The yellow-brown staining is caused by secondary oxidation of iron-rich minerals (limonite or hematite) that coat the surface or penetrate micro-cracks in the silica.
Uses & applications
Commonly used as a decorative landscaping stone or as a low-value collector specimen. High-quality iron quartz is sometimes used in metaphysical collections.
Geological facts
Also known as 'Limonitic Quartz' or 'Golden Healer' in the gem trade. The iron oxides often create a permanent 'stain' that cannot be washed off without chemical treatment like oxalic acid.
Field identification & locations
Identify in the field by its high hardness (scratches glass), lack of cleavage, and the characteristic rusty orange crust over crystalline silica. Found globally in riverbeds and mountainous terrain.
