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Picromerite: K2Mg(SO4)2ˇ6(H2O)
Comments: Blocky white picromerite crystals on reddish halite. Location: Heringen, Werra Valley, North Hesse, Hesse, Germany. Scale: Specimen Size 5.5 x 4.7 x 3.4 cm. © Rob Lavinsky
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
Smithsonite: ZnCO3 Fraipontite: (Zn,Al)3(Si,Al)2O5(OH)4 Zinalsite: Zn2AlSi2O5(OH)4ˇ2(H2O) (?)
Comments: Pearly white, sub-mm fraipontite (zinalsite) crystals associated with green smithsonite. Location: Lavrion District Mines, Lavrion District, Attikí (Attica; Attika) Prefecture, Greece. Scale: Specimen Size 1.4 x 1.0 x 0.9 cm. © 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: CaSnSi3O9ˇ2(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
Whewellite: Ca(C2O4)ˇ(H2O)
Comments: White crystal of whewellite, perched on a spray of brown calcite crystals. Location: Shaft 21, Schlema, Hartenstein, Germany. Scale: 7 x 6 x 4 cm. © Rob Lavinsky
Wulfenite: PbMoO4 Mimetite: Pb5(AsO4)3Cl
Comments: Gemmy, pale yellow mimetite crystal with brownish-orange wulfenite. Former James and Dawn Minette Collection. Location: Gem Pocket 1971, Tsumeb, Namibia. Scale: 2 x 1 x 1 cm. © Rob Lavinsky
Yttrocerite: CaF2 + (Y,Ce)F3
Comments: Blue/purpley Yttrocerite in matrix. Location: Rockport Granite Company quarry, Rockport, Essex Co., Massachusetts, USA. Scale: Specimen Size 6.9 x 3.7 x 1.8 cm. © Rob Lavinsky
Zinalsite: Zn2AlSi2O5(OH)4ˇ2(H2O) (?) Fraipontite: (Zn,Al)3(Si,Al)2O5(OH)4 Smithsonite: ZnCO3
Zircon: ZrSiO4
Comments: Deep red-wine colored, lustrous, internally bright zircon crystals in matrix. Location: Thorfjord, Seiland, Alta, Norway. Scale: 13 x 10.5 x 9 cm. © Rob Lavinsky
Zvyagintsevite: Pd3Pb
Comments: Sharp cubic crystal of zvyagintsevite. Location: Konder, Khabarovsk territories, Russian Far East, Russia. Scale: Crystal Size 0.5 x 0.5 x 0.2 cm. © Rob Lavinsky