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Tapiolite: (Fe,Mn)(Ta,Nb)2O6 Tapiolite-(Fe): (Fe++,Mn++)(Ta,Nb)2O6
Comments: Twinned, brown, dipyramid crystal of ferrotapiolite. Location: Sapucaia district, Galileia, Minas Gerais, Brazil. Scale: 4.2x3.1x3.1 cm. © Richard Dale / Dale Minerals
Tapiolite-(Fe): (Fe++,Mn++)(Ta,Nb)2O6 Tapiolite: (Fe,Mn)(Ta,Nb)2O6
Tellurium: Te Empressite: AgTe
Comments: Bronze-colored microcrystals of empressite with bright native tellurium crystals. Location: Rex mine, Boulder County, Colorado, USA. Scale: 1.9 x 1.4 x 0.7 cm. © Richard Dale / Dale Minerals
Tellurobismuthite: Bi2Te3
Comments: Platy hexagonal metallic crystals of tellurobismuthite to 3+ mm. in matrix. Location: Boliden, Skellefteå, Västerbotten, Sweden. Scale: 2.7x1.6x0.7 cm. © Richard Dale / Dale Minerals
Tinzenite: (Ca,Mn,Fe)3Al2BO3Si4O12(OH)
Comments: Orange bladed aggregate of tinzenite crystals and clear quartz. Location: Molinello mine, Val Graveglia, Italy. Scale: 5.8x3.6x3.3 cm. © Richard Dale / Dale Minerals
Wadeite: K2ZrSi3O9
Comments: Sharp hexagonal crystal of wadeite with included dark green aegirine. Location: Mt. Kukisvumchurr, Khibiny Massif (Russia). Scale: 12x10x6 mm. © Richard Dale / Dale Minerals
Winchite: [ ](CaNa)Mg4(Al,Fe3+)Si8O22(OH)2 Sodalite: Na8Al6Si6O24Cl2
Comments: Purple sodalite with some crystal faces, supporting a very sharp, transparent winchite crystal, terminated on one end. Location: Sar-e-Sang, Kokcha Valley, Badakshan Province, Afghanistan. Scale: 11x10x8 mm. © Richard Dale / Dale Minerals