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Siderite: Fe++CO3
Comments: Bladed siderite crystal groups on crystallized quartz matrix. Location: Peyrebrune, Tarn, France. Scale: 8.7 x 6.5 x 4.7 cm. © Fabre Minerals
Comments: Blocky siderite crystals on quartz. Location: Panasqueira (2nd level), in the region of Beira Baixa, Portugal. Scale: 7 x 8 cm. © Fabre Minerals
Silver: Ag Stephanite: Ag5SbS4
Comments: Thick, ropy, native silver wires with blocky, well-crystallized stephanite on white and tan calcite matrix. Location: Freiberg, Erzgebirge, Saxony, Alemania, Germay. Scale: Picture size 3 cm. © Fabre Minerals
Spinel: MgAl2O4
Comments: Spinel on white marble. Location: Mogok, Myanmar. Scale: 2.2 x 1.5 cm. © Fabre Minerals
Tantalite-(Mn): MnTa2O6
Comments: Floater crystal of doubly terminated, brilliant, with a little red tint manganotantalite. Location: Pech, Kunar, Afganistan. Scale: 5.5 x 7 cm. © Fabre Minerals
Tapiolite-(Fe): (Fe++,Mn++)(Ta,Nb)2O6 Tapiolite: (Fe,Mn)(Ta,Nb)2O6
Comments: Ferrotapiolite crystal in white quartz and mica matrix. Location: Quixabá Mine, Frei Martinho, Paraíba Brazil. Scale: Crystal size 1 x 0.8 cm. © Fabre Minerals
Teallite: PbSnS2
Comments: Gray, metallic vein of coarsely crystalline teallite. Location: Carguaycollo mine (type locality), Potosí , Bolivia. Scale: 4.5x4x2.5 cm. © Fabre Minerals
Telluronevskite: Bi3TeSe2
Comments: Granular, irregular, metallic grains of telluronevskite in white matrix. Location: Poruba pod, Vihorlat Mts. in the Slovak Republic. Scale: Picture Size 2 cm. © Fabre Minerals
Tennantite: (Cu,Fe)12As4S13
Comments: Crystals of dark gray tennantite on white quartz. Location: Concepcion del Oro, Zacatecas, Mexico. Scale: 6 x 5.5 cm. © Fabre Minerals
Tetrahedrite: (Cu,Fe)12Sb4S13
Comments: A very brilliant tetrahedrite group with the tops of the crystals covered in chalcopyrite. Location: Casapalca, Lima, Peru. Scale: 8 x 6 cm. © Fabre Minerals