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Nickel: Ni
Comments: Very small cubic crystal of native Nickel, isolated from an ore concentrate. Location: Nouméa, New Caledonia. Scale: Crystal size 0.1 mm. © Thomas Witzke / Abraxas-Verlag
Nickelalumite: (Ni,Cu)Al4[(SO4),(NO3)2](OH)12·3(H2O)
Comments: Aggregates of blue neckelaluminite spherulites on matrix. Location: Jomde mine, San Juan County, Utah, USA. Scale: See Image. © Rruff Database
Nickelaustinite: Ca(Ni,Zn)(AsO4)(OH)
Comments: Stellate aggregate of acicular nickelaustinite crystals associated with rhombohedral dolomite crystals. (CanMin, v25:401). Location: Bou Azzer, Anti-Atlas Mountains, Morocco. Scale: Scale Bar 100 µm. © Canadian Mineralogist
Nickelboussingaultite: (NH4)2(Ni,Mg)(SO4)2·6(H2O)
Comments: Fragment of sulfide (pyrite) matrix with microcoating of nickelboussingaultite in a gelatin capsule. Location: Noril'sk, Putoran Plateau, Taimyr Peninsula, Siberia, Russia. Scale: Capsule Size 20 mm. © John Betts - Fine Minerals
Nickelhexahydrite: (Ni,Mg,Fe++)(SO4)·6(H2O)
Comments: Pale greenish crust of ferroan nickelhexahydrite. Location: Sohland, Bautzen, Oberlausitz, Saxony, Germany. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Nickeline: NiAs
Comments: Stubby, crude blocky crystals of nickeline. Location: Gowaganda, Ontario, Canada. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Nickellotharmeyerite: Ca(Ni,Fe,Co)2(AsO4)2(OH,H2O)2
Comments: Brown, microcrystalline nickellotharmeyerite. Location: Pucher Shaft, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Nickelphosphide: (Ni,Fe)3P Melliniite: (Ni,Fe)4P
Comments: Reflected light image of creamy-yellowish melliniite (1) and nickelphosphide (3). AmMin, v91, p453. Location: Northwest Africa 1054 acapulcoite. Scale: See Image. © American Mineralogist
Nickelphosphide: (Ni,Fe)3P Kamacite: alpha-(Fe,Ni)
Comments: Small inclusion of nickelphosphide in massive kamacite. Location: Kenton County meteorite, Kenton Co., Kentucky, USA. Scale: Picture size 0.09 mm. © Thomas Witzke / Abraxas-Verlag
Nickelschneebergite: Bi(Ni,Co)2(AsO4)2(OH,H2O)2
Comments: Small crystals of nickelschneebergite. Location: Roter Berg, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 2 mm. © Thomas Witzke / Abraxas-Verlag