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Samarskite-(Y): (Y,Fe+++,U)(Nb,Ta)5O4
Comments: A black crystal of samarskite. Ex collection Gustav Rose 1832, found on his travel together with Alexander von Humboldt through the Ural Mts. Location: Miass, Ilmen Mts, Chelyabinsk Oblast', Urals Region, Russia. Scale: Crystal size 8 mm. © Thomas Witzke / Abraxas-Verlag
Samuelsonite: (Ca,Ba)Ca8(Fe++,Mn)4Al2(PO4)10(OH)2
Comments: Transparent crystal of samuelsonite. Location: Palermo #1 mine, Groton, Grafton Co., New Hampshire, USA. Scale: Picture size 2.2 mm. © Thomas Witzke / Abraxas-Verlag
Santabarbaraite: Fe+++3(PO4)2(OH)3·5(H2O)
Comments: Orange santabarbaraite pseudomorphous after vivianite. Location: Santa Barbara lignite district, San Giovanni Valdarno, Valdarno (Val d'Arno), Arezzo Province, Tuscany. Scale: Picture size 1.5 mm. © Thomas Witzke / Abraxas-Verlag
Sassolite: H3BO3
Comments: Colorless, pseudohexagonal crystals of sassolite. Location: Anna Mine, Alsdorf, Aachen, North Rhine-Westphalia, Germany. Scale: Picture size 2.5 mm. © Thomas Witzke / Abraxas-Verlag
Sazykinaite-(Y): Na5YZrSi6018·6(H2O)
Comments: Light brown crystals of sazykinaite-(Y). Location: Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Scarbroite: Al5(CO3)(OH)13·5(H2O)
Comments: White earthy scarbroite. Location: South Bay, Scarborough, North Yorkshire, England, UK. Scale: Picture size 8 mm. © Thomas Witzke / Abraxas-Verlag
Schieffelinite: Pb(Te++++++,S)O4·(H2O) Rodalquilarite: H3Fe+++2(Te++++O3)4Cl
Comments: Creamy white Schieffelinite with minor green rodalquilarite. Location: Tombstone, Tombstone District, Cochise Co., Arizona, USA. Scale: Picture size 6 mm. © Thomas Witzke / Abraxas-Verlag
Schmitterite: (UO2)TeO3 Emmonsite: Fe+++2Te++++3O9·2(H2O)
Comments: Yellow schmitterite with green emmonsite. Location: Moctezuma, Mun. de Moctezuma, Sonora, Mexico. Scale: Picture size 4 mm. © Thomas Witzke / Abraxas-Verlag
Schneebergite: Bi(Co,Ni)2(AsO4)2(OH,H2O)2
Comments: Prismatic, acicular crystals of schneebergite. Location: Roter Berg, Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 1.7 mm. © Thomas Witzke / Abraxas-Verlag
Schoenfliesite: MgSn++++(OH)6
Comments: Yellow-brown schoenfliesite on matrix. Location: Zlaty Kopec, Jáchymov (St Joachimsthal), Krusné Hory (Erzgebirge), Západoceský Kraj, Bohemia, Czech Republic. Scale: Picture size 5 mm. © Thomas Witzke / Abraxas-Verlag