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Members of the nigerite group are:
ferronigerite-2N1S
(Al,Fe,Zn)2(Al,Sn)6O11(OH)
ferronigerite-6N6S (Al,Fe,Zn)3(Al,Sn,Fe)8O15(OH)
magnesionigerite-2N1S (Mg,Al,Zn)2(Al,Sn)6O11(OH)
magnesionigerite-6N6S (Mg,Al,Zn)3(Al,Sn,Fe)8O15(OH)
zinconigerite-2N1S (Zn,Al,Mg)2(Al,Sn)6O11(OH)
zinconigerite-6N6S Zn3Sn2Al16O30(OH)2
They are all hydroxide minerals.
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