Decagonite
Decagonite is an IMA-recognized mineral species in the native element class, with the chemical formula Al₇₁Ni₂₄Fe₅.
Key properties: Metallic luster.
IMA symbol Dec, IMA status: approved, named in 2015.
From impact shock metamorphism in a CV3 carbonaceous chondrite meteorite.
It is found associated with Al-bearing trevorite, diopside, forsterite, ahrensite, clinoenstatite, nepheline, coesite, pentlandite, Cu-bearing troilite, icosahedrite, khatyrkite, taenite.
The name refers to the 10-fold symmetry of its crystal structure.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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