ferronigerite-2N1S

{{Infobox mineral | name = Ferronigerite-2N1S | boxwidth = | boxbgcolor = | image = Ferronigerite-2N1S-273155.jpg | imagesize = | alt = | caption = Ferronigerite-2N1S from Stiepelmann mine, Arandis, Swakopmund district, Erongo region, Namibia | category = Oxide minerals | formula = {{chem2|(Zn,Mg,Fe^{2+})(Sn,Zn)2(Al,Fe^{3+})12O22(OH)2}} | IMAsymbol = Fng-2N1S | molweight = | strunz = 4.FC.20 | system = Trigonal | class = Hexagonal scalenohedral (m) H-M symbol: ( 2/m) | symmetry = Pm1 | unit cell = | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = | luster = | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }} Ferronigerite-2N1S is an iron, tin, alumino-hydroxide mineral that naturally occurs around sillimanite-quartz veins. Ferronigerite-2N1S belongs to the nigerite group, högbomite supergroup. The other constituents of the nigerite group are ferronigerite-6N6S, magnesionigerite-2N1S, magnesionigerite-6N6S, zinconigerite-2N1S and zinconigerite-6N6S. The 2N1S ending stands for the nolanite and spinel structural layers.

Ferronigerite-2N1S was first discovered in the Kabba province of central Nigeria in 1944; it was originally named Nigerite. Its name was later changed to nigerite-6H then to nigerite-6T and in 2003 ferronigertie-2N1S was approved by the International Mineralogical Association.