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Potarite: PdHg
Comments: Potarite grains in a geletin capsule. Location: Potaro River, Kangaruma District, Guyana. Scale: Sample Size 4.1 x 2.2 x 1.9 cm. © Rob Lavinsky
Potassic-fluororichterite: (K,Na)(CaNa)Mg5[Si8O22]F2
Comments: Transparent, prismatic crystal of potassic-fluororichterite. Location: Koksha Valley, Badakhshan Province, Afghanistan. Scale: Specimen Size 2.7 x .6 x .2 cm. © Rob Lavinsky
Potosiite: Pb6Sn2FeSb2S14 Franckeite: (Pb,Sn)6Fe++Sn2Sb2S14
Comments: Visually indistinguishable metallic potosiite/franckeite crystals to 6 mm.. Location: San Jose mine, Oruro City, Oruro Department, Bolivia. Scale: Crystal size 6 mm. © Rob Lavinsky
Sternbergite: AgFe2S3
Comments: Silvery, blocky to prisimatic sternbergite crystals with minor red pyrargyrite. Location: Jáchymov (St Joachimsthal), Ostrov, Krusné Hory Mts (Erzgebirge), Karlovy Vary Region, Bohemia (Böhmen; Boehmen), Czech Republic. Scale: Specimen Size 13 x 7 x 3.5 cm. © Rob Lavinsky
Stillwellite-(Ce): (Ce,La,Ca)BSiO5
Comments: Brownish red euhedral crystal of stillwellite-(Ce) in matrix under halogen or sunlight lighting. Inset image shows the yellow color-change under fluorescent lighting. Location: Darai -Piez Massif, Alay Range of Tien-Shan' Mountains, Garm Region, Tajikistan. Scale: Crystal Size 1.3 cm. © Rob Lavinsky
Stokesite: CaSnSi3O9·2(H2O)
Comments: Thick, tabular crystals of stokesite, perched atop a 2 cm sphere of feldspar crystals. Location: Corrego do Urucum, near Galilea, Minas Gerais, Brazil. Scale: 3.3 x 2.5 x 2 cm. © Rob Lavinsky
Tantalite-(Fe): Fe++Ta2O6
Comments: Blocky, crystalline aggregate of ferrotantalite crystals weighing over one kilogram. Location: Ecuador, Minas Gerais, Brazil. Scale: 10 x 6 x 5 cm. © Rob Lavinsky
Tellurite: TeO2
Comments: Prismatic, reddish brown tellurite crystal clusters to 5-6mm in a vug,lined with drusy quartz. Location: Bambolla Mine, Moctezuma, Sonora, Mexico. Scale: Picture Size 2 cm. © Rob Lavinsky
Tornebohmite-(Ce): (Ce,La,Nd)2Al(SiO4)2(OH)
Comments: Vein of dark green tornebohmite-(Ce) with selveges of black allanite-(Ce) in a K-feldspar matrix. Location: Jamestown District, Boulder Co., Colorado, USA. Scale: Specimen Size 6.5 x 3.8 x 2.5 cm. © Rob Lavinsky
Toyohaite: Ag2FeSn3S8
Comments: Acicular needles of metallic toyohaite on matrix. Location: Pirquitas (sector Oploca, level 7 1/4), Jujuy, Argentina. Scale: Specimen size 7.1 x 5.6 x 3.4 cm. © Rob Lavinsky