mineral
Eisenrose or Iron-stained Quartz Nodule
Silicon dioxide with iron oxide coating (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, earthy reddish-brown color due to iron staining, dull to vitreous luster, and cryptocrystalline or microcrystalline quartz structure.
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Physical properties
Hardness of 7 on the Mohs scale, earthy reddish-brown color due to iron staining, dull to vitreous luster, and cryptocrystalline or microcrystalline quartz structure.
Formation & geological history
Formed via hydrothermal precipitation or groundwater mineral deposition within cavities in host rocks over millions of years.
Uses & applications
Used primarily as mineral specimens for display, educational collections, and lapidary art.
Geological facts
Iron oxide coatings frequently give these nodules a deceptive rusty appearance that masks the quartz crystals hidden inside.
Field identification & locations
Identify by its spherical to nodular habit, heavy feel, and distinct reddish exterior; often found in weathered limestone or sedimentary regions.
