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Sicklerite: Li(Mn++,Fe+++)PO4 Lithiophilite: LiMnPO4
Comments: Mottled tan-green-pink massive sicklerite with dark brown lithiophilite on quartz. Location: Custer Mountain Lode, Custer County, South Dakota, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Siderazot: Fe5N2
Comments: Bluish siderazot coatings on scoria lava rock. Location: Eruption of 1941, Vesuvius, Campania, Italy. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Siderophyllite: KFe++2Al(Al2Si2)O10(F,OH)2
Comments: Micaceous siderophyllite with quartz. Location: Karaoba, Aktjubinsk, Kazakhstan. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Siderotil: Fe++SO4·5(H2O)
Comments: Siderotil pseudomorphs after melanterite. Location: 2700' level, Campbell Shaft, Bisbee, Cochise County, Arizona, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sidorenkite: Na3Mn(PO4)(CO3)
Comments: Dark brown sidorenkite masses in syenite rock. Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sidwillite: MoO3·2(H2O)
Comments: Thin olive-green sidwillite coatings on quartz crystals. Location: Lake Como, Summit County, Colorado, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Silhydrite: 3SiO2·(H2O)
Comments: Fine grained massive silhydrite. Location: Near Rome, Oregon, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sillimanite: Al2SiO5 = Al[6]Al[4]OSiO4
Comments: Silky massive sillimanite. Location: Khasia Hills, Assum, India. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Simpsonite: Al4(Ta,Nb)3O13(OH)
Comments: Translucent pale pink simpsonite crystal fragment. Location: Alto do Giz, Equidor, Rio Grande do Sol, Brazil. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species
Sinhalite: MgAlBO4
Comments: Crystalline sinhalite in white marble. Location: Amity, near Warwick, Orange County, New York, USA. Scale: See Photo. © Jeff Weissman / Photographic Guide to Mineral Species