igneous
Iron-Nickel Meteorite (Possible Chondrite or Oxidized Iron)
Siderite (Nickel-Iron) or Chondrite (Si/Fe composite)
Hardness: 4.5-5.5 (Mohs scale), Color: Rusty brown to dark gray/black exterior, Luster: Metallic to sub-metallic (often dull due to oxidation), Crystal Structure: Octahedral or massive, Specific Gravity: 7.0-8.0 (for iron-rich) or 3.0-4.0 (for stone-heavy types). Often magnetic.
- Hardness
- 4
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Physical properties
Hardness: 4.5-5.5 (Mohs scale), Color: Rusty brown to dark gray/black exterior, Luster: Metallic to sub-metallic (often dull due to oxidation), Crystal Structure: Octahedral or massive, Specific Gravity: 7.0-8.0 (for iron-rich) or 3.0-4.0 (for stone-heavy types). Often magnetic.
Formation & geological history
Formed in the core of ancient protoplanets (iron types) or the solar nebula (stony types) approximately 4.5 billion years ago. These artifacts are remnants of the early solar system that survived atmospheric entry.
Uses & applications
Primarily for scientific research and private collecting. Iron-nickel is also a source of extraterrestrial metals like iridium and kamacite, and occasionally used in custom knife-making or high-end jewelry (slices).
Geological facts
Many meteorites found on Earth are older than the planet itself. The brown crust visible is likely a 'fusion crust' that formed as the rock melted while passing through Earth's atmosphere, then oxidized (rusted) over time.
Field identification & locations
Identify in the field by checking for high density (heavier than normal rocks), magnetism, and a distinct regmaglypts (thumbprint-like indentations). Commonly found in desert regions or Antarctica where they stand out. Check for a silver-metallic window by grinding a small corner.
