igneous
Iron Meteorite (Candidate)
Siderite (Meteoric Iron)
Hardness: 4-5 (Mohs), Color: Dark brown to black (fusion crust) or rusty, Luster: Metallic (when cut) or dull/sub-metallic, Structure: Massive with regmaglypts (thumbprints), Specific Gravity: 7.0-8.0
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Physical properties
Hardness: 4-5 (Mohs), Color: Dark brown to black (fusion crust) or rusty, Luster: Metallic (when cut) or dull/sub-metallic, Structure: Massive with regmaglypts (thumbprints), Specific Gravity: 7.0-8.0
Formation & geological history
Formed in the molten cores of differentiated asteroids or protoplanets billions of years ago. These bodies were broken apart by collisions, eventually falling to Earth through atmospheric entry.
Uses & applications
Predominantly used for scientific research, private collections, and high-end jewelry (slices showing Widmanstätten patterns). Historically used for early iron tools.
Geological facts
True iron meteorites often exhibit Widmanstätten patterns when etched with acid. Identifying 'thumbprint' indentations called regmaglypts on the surface is a key indicator of atmospheric ablation.
Field identification & locations
Identify by high density (heavy for its size) and strong attraction to magnets. Check for a thin dark 'fusion crust'. Commonly found in arid deserts or ice fields where weathering is minimized.
