mineral
Iron-stained Quartz
Silicon Dioxide with Limonite (SiO2 + FeO(OH)·nH2O)
Hardness: 7 (Mohs scale); Color: Yellow-orange to rusty brown staining over white/clear base; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 (Mohs scale)
- Color
- Yellow-orange to rusty brown staining over white/clear base
- Luster
- Vitreous to dull
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Physical properties
Hardness: 7 (Mohs scale); Color: Yellow-orange to rusty brown staining over white/clear base; Luster: Vitreous to dull; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Forms in hydrothermal veins or as a secondary mineral in sedimentary environments where iron oxides (like limonite or goethite) precipitate from groundwater onto the surfaces and cracks of quartz crystals.
Uses & applications
Primarily collected as a mineral specimen; occasionally used in lapidary for carvings or as landscaping stone. Pure quartz is used in glass making and electronics.
Geological facts
The yellow coloration is not typically inside the crystal lattice but is a surface coating or infusion into micro-fractures known as iron staining. It is often colloquially called 'Golden Healer' in metaphysical circles.
Field identification & locations
Can be identified by its 7 hardness (scratches glass) and its resistant nature. Look for it in areas with high mineral mineralization or eroded outcroppings. Collectors use oxalic acid to remove the stain if they want a clear specimen.
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Schist
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Metamorphic
Potassium Feldspar (Orthoclase)
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Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Mineral
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
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