Ataxite

Ataxites (from Greek meaning "without structure") are a structural class of iron meteorites with a high nickel content and show no Widmanstätten patterns upon etching.

Ataxite
 Structural class 
The Chinga meteorite is an ataxite.
GroupIVB or "Iron, ungrouped", occasionally IAB or others
CompositionMainly Meteoric iron, nickel (>18%), no Widmanstätten patterns
A phase diagram showing the link between structural and chemical classification.
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