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Mattheddleite: Pb20(SiO4)7(SO4)4Cl4
Comments: Radial aggregates of colorless hexagonal microcrystals of mattheddleite with minor blue-green caledonite. Location: Dry Smale Gill, Roughton Gill, Caldbeck Fells, Cumbria (Cumberland), England, United Kingdom. Scale: See Image. © Rruff Database
Miassite: Rh17S15
Comments: Composite image of dark gray metallic polished grains and pale yellow vanadinite embedded in epoxy. Miassite occurs as a small inclusion in the larger isoferrplatinum grain on the inset BSE image. Location: Yukhtochka placer, Tributary of Aldan River, Yakutia, Russia. Scale: See Image. © Rruff Database
Nabalamprophyllite: Ba(Na,Ba){Na3Ti[Ti2O2Si4O14](OH,F)2}
Comments: Yellowish brown platy nabalamprophyillite cluster in matrix. Location: Slyuda (mica) quarry, Kovdor, Kola Peninsula, Russia. Scale: See Image. © Rruff Database
Nabokoite: Cu++7Te++++O4(SO4)5·KCl
Comments: Brown thin tabular plates, co-type material. Location: Tolbachik Volcano, Kamchatka, Russia. Scale: See Image. © Rruff Database
Natrobistantite: (Na,Cs)Bi(Ta,Nb,Sb)4O12
Comments: Bluish-green fragments of natrobistantite embedded in epoxy, co-type material. Location: Kyoktogai pegmatite field, Altai, Xinjinag Province, China. Scale: See Image. © Rruff Database
Natroboltwoodite: (H3O)(Na,K)(UO2)SiO4·(H2O)
Comments: Pale yellow, massive, waxy natroboltwoodite. Location: Alluaiv Mountain, Lovozero, Russia. Scale: See Image. © Rruff Database
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
Nickelskutterudite: (Ni,Co)As3-x Dienerite: Ni3As
Comments: Aggregate of silver-gray nickelskutterudite cubes, some tarnished to a brassy color. Dienerite is now considered to be nickelskutterudite. Location: Hasserode, Harz, Germany. Scale: See Image. © Rruff Database
Niksergievite: [Ba,Ca)2(Al,Si)7O10(CO3)(OH)6·nH2O
Comments: Pale blue to colorless lamellar fragment of niksergievite. Location: Tekeli mine, Karatau, Kazakhstan. Scale: See Image. © Rruff Database
Otavite: CdCO3
Comments: White rhombohedra of otavite. Location: Tsumeb mine, Tsumeb, Otavi District, Oshikoto, Namibia. Scale: See Image. © Rruff Database