Ferronigerite-6N6S
Ferronigerite-6N6S is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula (Al,Fe,Zn)₃(Al,Sn,Fe)₈O₁₅(OH).
It crystallizes in the hexagonal crystal system (space group R-3). It is a member of the Hogbömite-Nigerite structural group.
Key properties: specific gravity 4.42.
IMA symbol Fng-6N6S, IMA status: approved, named in 1947.
Found in quartz-sillimanite rocks closely in association with tin-bearing granite pegmatites (Egbe district, Nigeria); in tin-bearing skarns (Mt. Garnet, Australia).
It is found associated with Gahnite (Egbe district, Nigeria); magnetite, fluorite, biotite, gahnite, corundum, cassiterite (Mt. Garnet, Australia).
As the 24R polytype of nigerite-6H.
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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