igneous
Iron Meteorite (likely Chondrite or Iron-Nickel fragment)
Siderite (Iron Meteorite), primarily Fe-Ni (Iron-Nickel) alloy
Hardness: 4-5 Mohs; Color: Brownish-black fusion crust with metallic interior; Luster: Metallic to dull; Crystal structure: Octahedral (Widmanstätten pattern inside); Cleavage: None; Specific Gravity: 7.0-8.0
- Hardness
- 4-5 Mohs
- Color
- Brownish-black fusion crust with metallic interior
- Luster
- Metallic to dull
Identified More igneous →
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Physical properties
Hardness: 4-5 Mohs; Color: Brownish-black fusion crust with metallic interior; Luster: Metallic to dull; Crystal structure: Octahedral (Widmanstätten pattern inside); Cleavage: None; Specific Gravity: 7.0-8.0
Formation & geological history
Formed in the early solar system approximately 4.5 billion years ago from the molten core of a shattered planetesimal; delivered to Earth through atmospheric entry resulting in high-heat ablation.
Uses & applications
Scientific research into planetary formation; used in high-end jewelry (meteorite watch dials/rings) and collector markets.
Geological facts
Many iron meteorites feature a 'Widmanstätten pattern' when etched with acid, a crystal structure that takes millions of years of slow cooling in space to form. This specimen shows a classic regmaglypt-like surface feature (thumbprint indentation).
Field identification & locations
Identify by checking for magnetism and extreme density; look for a thin, dark fusion crust. Often found in dry desert regions or ice fields where dark rocks stand out. Avoid 'meteor-wrongs' like slag by checking for bubbles (meteorites generally have no vesicles).
