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Selenium: Se
Comments: Acicular crystals of native Selenium (up to 1 cm in length). Location: Ronneburg U deposit, Gera district, Thuringia, Germany. Scale: Specimen size 3 cm. © Thomas Witzke / Abraxas-Verlag
Seligmannite: PbCuAsS3 Liveingite: Pb9As13S28
Comments: Black prismatic seligmannite crystals with crystalline black liveingite. Location: Lengenbach Quarry, Binnental, Valais, Switzerland. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Seligmannite: PbCuAsS3
Comments: Lead gray, prismatic seligmannite crystal with brassy yellow pyrite on white dolomite. Location: Lengenbach quarry, Binntal, Valais, Switzerland. Scale: Crystal size 2 mm. © Walter Gabriel
Sellaite: MgF2
Comments: Compact, white acicular sellaite crystals. Location: Clara Mine, Rankach valley, Oberwolfach, Wolfach, Black Forest, Baden-Württemberg, Germany. Scale: 21x16x10 mm. © John Betts - Fine Minerals
Selwynite: NaK(Be,Al)Zr2(PO4)4·2(H2O)
Comments: Dark purplish blue crystal of selwynite. Location: A granite quarry near Wycheproof, NW Victoria, Australia.. Scale: Not Given. © Museum Victoria
Semenovite: (Na,Ca)9(Ce,La)2(Fe++,Mn)(Si,Be)20(O,OH,F)48
Comments: Tan crystals of semenovite to 1 mm across on matrix. Location: Ilimaussaq, Tasseq, Greenland. Scale: Picture size 1 cm. © John Veevaert
Semseyite: Pb9Sb8S21
Comments: Crystal clusters of semseyite crystals to 1 cm on sphalerite. Location: Herja, Romania. Scale: Picture size 5 cm. © John Veevaert
Comments: Tabular crystals forming groups and rosettes of gray semseyite with creamy greenish yellow siderite. Location: Herja mine, Maramures Rumania. Scale: 6.5 x 6 x 3.5 cm. © Fabre Minerals
Senaite: Pb(Ti,Fe,Mn)21O38
Comments: Brownish-black senaite cleavage. Location: Dattas, near Diamantina, Minas Gerais, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Comments: Black crystal of senaite. Location: Presidente Kibitschek, Minas Gerias, Brazil. Scale: Crystal size 2 mm. © Dave Barthelmy
Senarmontite: Sb2O3
Comments: Perfect octahedral, transparent, light to dark gray senarmontite crystals to 3mm. Location: Djebel Haminate mine, Ain Beida, Constantine, Algeria. Scale: Pictrure size 1.5 cm. © Tom Loomis / Dakota Matrix
Senegalite: Al2(PO4)(OH)3·(H2O)
Comments: Yellowish green, prismatic, crystals of senegalite. Location: Faleme River, Senegal. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Sengierite: Cu2(UO2)2V2O8·6(H2O)
Comments: Green, tabular, crystals of sengierite on matrix. Location: Lubumbashi, Shaba, Democratic Republic of the Congo. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Sepiolite: Mg4Si6O15(OH)2·6(H2O)
Comments: Sectile to chalky massive sepiolite. Location: Pinos Altos, Grant County, New Mexico. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Serandite: Na(Mn++,Ca)2Si3O8(OH) Analcime: NaAlSi2O6·(H2O) Natrolite: Na2[Al2Si3O10]·2(H2O)
Comments: Orange-red, blocky serandite with white, blocky natrolite and white, equant grains of analcime. Location: Mt. St. Hilaire, Canada. Scale: 4 x 3 cm. © Fabre Minerals
Serandite: Na(Mn++,Ca)2Si3O8(OH) Lintisite: Na3LiTi2Si4O14·2(H2O)
Comments: Yellowish-white fibrous veinlets of lintisite in brown serandite. Location: Mount Alluaiv, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Serendibite: Ca2(Mg,Al)6(Si,Al,B)6O20 Phlogopite: KMg3(Si3Al)O10(F,OH)2
Comments: Blue serendibite, with golden colored phlogopite, in white marble. Location: Near Johnsberg, Warren County, New York, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Serpierite: Ca(Cu,Zn)4(SO4)2(OH)6·3(H2O)
Comments: Blue, acicular crystals of serpierite. Location: Serpieri mine, Laurium, Greece. Scale: Not Given. © Lou Perloff / Photo Atlas of Minerals
Serrabrancaite: MnPO4·(H2O)
Comments: SEM micrograph of dark brown to dark greenish black isometric crystals of serrabrancaite up to 0.3 mm size. (AmMin, 85:848). Location: Alto Serra Branca pegmatite near Pedra Lavrada, Paraiba, Brazil. Scale: See Image. © American Mineralogist
Sewardite: CaFe+++2(AsO4)2(OH)2
Comments: Photomicrograph of an isolated fragment of red sewardite as well as a fragment in green to black botryoidal matrix. Location: Single specimen of gangue collected from the 31st level of the Tsumeb mine, Tsumeb, Namibia. Scale: See Image. © Canadian Mineralogist