Proxidecagonite
Proxidecagonite is an IMA-recognized mineral species in the native element class, with the chemical formula Al₃₄Ni₉Fe₂.
It crystallizes in the orthorhombic crystal system (space group Pnma).
Key properties: specific gravity 2.619; Black streak; Metallic luster.
IMA symbol Pdec, IMA status: approved, named in 2018.
Found in shock metamorphosed portions of a CV3 carbonaceous chondrite meteorite.
It is found associated with Trevorite, diopside, forsterite, ahrensite, clinoenstatite, nepheline, coesite, stishovite, pentlandite, Cu-rich troilite, Al-rich taenite, icosahedrite.
The prefix, proxi, derived from the Latin word proximus indicates a species that is a periodic approximant to decagonite.
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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