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Minerals

6323 results

Mineral

Tantalaeschynite-(Ce)

tantalaeschynite-(Ce)

Formula
Ce(TiTa)O6
Brownish black resinous crystal aggregates of the very rare Y-Ta mineral tantalaeschynite-(Y) from the TL in Raposa pegmatite (Raposa Pegmatite, São José do Sabugi, Borborema Province, Paraiba, Brazil). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Tantalaeschynite-(Y)

tantalaeschynite-(Y)

Formula
Ce(TiTa)O6
Unpolished microprobe preparate with a 0,20 x 0,15 x 0,10 mm grain of bronze-pinkish Tantalcarbide from the type and only known locality worldwide (Avrorinskii Placer, Aktai River, Baranchinsky Massif, Nizhnii Tagil, Sverdlovsk Oblast, Russian Federation), completely analyzed. The exact formula of this specimen is (Ta0,80Nb0,20)C. Part of holotype, portion of original material sold by Krantz to FMM in 1912 and collected at the beginning of XX century. This material was investigated and led to an article describing the new isomorphous series TaC-NbC from platinum placers of the Urals. Mineral

Tantalcarbide

tantalcarbide

Formula
TaC
Tantalite-(Fe) Locality: Linópolis, Divino das Laranjeiras, Doce valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) Size: 5.8 x 4.9 x 2.8 cm. This is a heavy (163 grams), sharp crystal with stunning lustre and unusually equant form. The thin striations that run laterally along the large faces give it depth and dimensionality, though it is overall a thin crystal relative to its width in front. It is complete on the top and right/upper terminations and complete on most of the downward pointing left termination as well. The small flower of crystallized albite is a contrast in the center is a fine accent. Mineral

Tantalite-(Fe)

tantalite-(Fe)

Formula
Fe²⁺Ta2O6
Mineral

Tantalite-(Mg)

tantalite-(Mg)

Formula
MgTa2O6
Manganotantalite Locality: Shigar Valley, Skardu District, Baltistan, Northern Areas, Pakistan (Locality at mindat.org) Size: thumbnail, 1.4 x 1.4 x 1.3 cm Manganotantalite A beautiful, complete crystal with distinctive red color, more than usual in fact; and nicely beveled edges. Ex. Laura and Stevia Thompson Collection. Mineral

Tantalite-(Mn)

tantalite-(Mn)

Formula
Mn²⁺Ta2O6
Black single crystal of the rare tantalum mineral tantalowodginite from a little known locality in Alabama: Coosa County, Alabama, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Tantalowodginite

tantalowodginite

Formula
(Mn☐)TaTa2O8
Brown black tanteuxenite associated to tantalite from DR Congo (Liha, Sankuru, DR Congo). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Tanteuxenite-(Y)

tanteuxenite-(Y)

Formula
Y(TaTi)O6
Mineral

Tantite

tantite

Formula
Ta2O5
Tapiaite is a extremely rare new mineral. It occurs as colorless transparent tabular crystals with a vitreous luster. In this specimen it is associated to pale blue very nice joteite crystals. From: Jote Mine, Tierra Amarilla, Atacama Region, Chile. Mineral

Tapiaite

tapiaite

Formula
Ca5Al2(AsO4)4(OH)4·12H2O
Tapiolite Locality: Baixão da Laje mine, Parelhas, Borborema mineral province, Rio Grande do Norte, Northeast Region, Brazil (Locality at mindat.org) Size: 1.4 x 1.3 x 0.7 cm. Tapiolite is actually a group name for the Ferrotapiolite-Manganotapiolite series. Iron and manganese can substitute for one another, and also the rare elements tantalum and niobium - two elements you almost never see in mineral specimens. Good crystals such as this are very rare! And this one is lustrous, sharp and complete, with shiny faces and only one contact on the underside. Ex. Carl Davis Coll., old piece. Mineral

Tapiolite-(Fe)

tapiolite-(Fe)

Formula
(Fe,Mn)(Ta,Nb)2O6
Dark brown crystal aggregates of the rare Mn mineral tapiolite-(Mn) from a locality in Western Australia (Yinnietharra, Upper Gascoyne Shire, Western Australia, Australia). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Tapiolite-(Mn)

tapiolite-(Mn)

Formula
Mn²⁺Ta2O6
:Locality: La Madrelena Mine, Tres Pozos, Baja California Norte, Mexico Size: 5.5 × 4.5 × 3.5 cm Largest Crystal: 1.10cm Description: Thin platy veins of lustrous and translucent, rich strawberry-colored gillespite are emplaced in beautifully color contrasting white mica-like plates of sanbornite. Gillespite is a rare barium, iron silicate and sanbornite is a barium silicate. Accompanied also by brown taramellite. This is a colorful piece of the species. Ex. Renaud Vochten (USA) collection. Collected: 1994 Mineral

Taramellite

taramellite

Formula
Ba4(Fe³⁺,Ti,Fe²⁺,Mg)4(B2Si8O27)O2Clx
Stützite Locality: Itinga, Jequitinhonha valley, Minas Gerais, Southeast Region, Brazil (Locality at mindat.org) Size: 6.7 x 6.2 x 3.3 cm. Taramite is a surprisingly rare member of the amphibole group in crystalline form, and this is a superb, large, radiating crystal spray. Mineral

Taramite

taramite

Formula
NaCaNa(Mg3Al2)Al2Si6O22(OH)2
White aggregataes of the rare taranakite on matrix. From: Parwan Lava Caves, Bacchus Marsh, Victoria, Australia. Mineral

Taranakite

taranakite

Formula
K3Al5(PO3OH)6(PO4)2·18H2O
Mineral

Tarapacáite

tarapacáite

Formula
K2CrO4
Mineral

Tarbagataite

tarbagataite

Formula
(K☐)Ca(Fe,Mn)7Ti2(Si4O12)2O2(OH)5
Tarbuttite Locality: Skorpion Mine, Rosh Pinah, Lüderitz District, Karas Region, Namibia (Locality at mindat.org) Size: miniature, 4.1 x 2.8 x 1.6 cm Tarbuttite An elegantly formed specimen of large tarbuttite "sheaves" from this new find. In person, the color of the tarbuttite is a soft pastel green, very unusual and interesting! It is translucent when backlit. Mineral

Tarbuttite

tarbuttite

Formula
Zn2(PO4)(OH)
Mineral

Tarkianite

tarkianite

Formula
(Cu,Fe)(Re,Mo)4S8
Pyrargyrite Locality: St Andreasberg, St Andreasberg District, Harz Mts, Lower Saxony, Germany (Locality at mindat.org) Size: large cabinet, 17.3 x 13.1 x 2.3 cm Pyrargyrite There are classic old mineral specimens that predate the 20th century. Then there are the true old-timer specimens that predate the 19th century, like this pyrargyrite from the Ferguson Collection, circa 1800 (he had stopped collecting by 1810, it is thought). Dendritic crystals of lustrous, black pyrargyrite to 5.0 cm in length are emplaced the length of a flat gray limestone matrix. Even the back side is interesting with a mass of spongy, dark gray silver and ore. When historically important specimens, like this from St. Andreasberg in the Harz Mountains, are also visually important, a pretty specimen becomes significant beyond its eye appeal. This is a piece that is much better in person, and impresses even those who do not collect the silver species. The crystals have a slight red overtone, and definite lustre to them. I have known the piece since 1998 when this collection came to light in London, when it resurfaced from the family's estate after being passed through the generations largely untouched. Ed David originally acquired the piece from Herb Obodda when Herb got back with specimens from this collection. Ex. Dr. Edward David Collection. Mineral

Tartarosite

tartarosite

Formula
C
Mineral

Tarutinoite

tarutinoite

Formula
Ag3Pb7Bi7S19
Mineral

Taseqite

taseqite

Formula
Na12Sr3Ca6Fe3Zr3Nb[(Si3O9)2(Si9O27)2SiO]Cl2(O,OH,H2O)3
Mineral

Tashelgite

tashelgite

Formula
CaMgFe²⁺Al9O16(OH)
Mineral

Tassieite

tassieite

Formula
NaCa2Mg3Fe²⁺2F³⁺(PO4)6·2H2O