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Tincalconite (after borax) - Locality: Boron, California - Bureau of Mines, Mineral Specimens C\01733 Mineral

Tincalconite

tincalconite

Formula
Na2B4O5(OH)4·3H2O
Outstanding white crystals of the very rare organic mineral tinnunculite from one of the few known localities worldwide: Laurenburg, Diez, Rhein-Lahn, Rhineland-Palatinate, Germany. Analyzed by XRD (ref. A993). A naturally occurring dihydrate of uricite (uric acid) to which it is visually very similar. Ex. Erich Laskowski collection (USA). Mineral

Tinnunculite

tinnunculite

Formula
C5H4N4O3·2H2O
Tinsleyite Locality: Bendada Quarries, Sabugal, Guarda District, Portugal (Locality at mindat.org) Field of view 3 mm. Depth of field is achieved with CombineZM. Specimen and photo Leon Hupperichs. Mineral

Tinsleyite

tinsleyite

Formula
KAl2(PO4)2(OH)(H2O)2
Tinticite (cream) with calcioferrite (green). Elvira mine, Gavá (Barcelona) Spain Mineral

Tinticite

tinticite

Formula
Fe³⁺5.34(PO4)3.62(VO4)0.38(OH)4·3H2O
Shiny metallic crystal of this very rare Pb-Cu-Sb-Bi sulphosalt known from a few places worldwide. From: Deer Park Mine, Rossland, British Columbia, Canada. Tintinaite usually occur as included crystals in quartz matrix, but this specimen has a crystal out of the matrix. Microprobed specimen in Dr.Hartel collection. Mineral

Tintinaite

tintinaite

Formula
Pb10Cu2Sb16S35
Tinzenite, Calcite Locality: Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Size: 4.5 x 3.5 x 3 cm. Charlie says this is by 2 orders of magnitude the best of species, and I believe him. Even more surprising is the locality, as I’d never heard of tinzenite from South Africa before. These crystals have the color of the best serandite and lustre like glass. They reach 1.5 cm in size. Overall, it’s an extraordinarily beautiful specimen that is also of mineralogical significance. Ex. Charlie Key. Mineral

Tinzenite

tinzenite

Formula
Ca6Al4[B2Si8O30](OH)2
Tiptopite Locality: Tip Top Mine (Tip Top pegmatite), Fourmile, Custer District, Custer County, South Dakota, USA (Locality at mindat.org) White Tiptopite on brown Roscherite. Picture width 3 mm. Collection and photograph Christian Rewitzer Mineral

Tiptopite

tiptopite

Formula
K2(Li,Na,Ca)6(Be6P6)O24(OH)2·1.3H2O
Tiragalloite Locality: Molinello Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy (Locality at mindat.org) Orange Tiragalloite crystals on Ganophyllite. Field of view 5mm. Specimen and photo Leon Hupperichs. Mineral

Tiragalloite

tiragalloite

Formula
Mn²⁺4As5+Si3O12(OH)
Tischendorfite (tsh): Pd8Hg3Se9, Chrisstanleyite (c): Ag2Pd3Se4, Clausthalite (cla): PbSe, Tiemannite (tie): HgSe, Stibiopalladinite: Pd5Sb2, Ankerite: Ca(Fe2+,Mg)(CO3)2 Locality: Eskaborn Adit, Tilkerode (Abberode), Harz, Saxony-Anhalt, Germany Horizontal field 275 microns. Reflected light digital image illustrating tischendorffite (tsh), chrisstanleyite (c), clausthalite (cla), tiemannite (tie), and minor stibiopalladinite in a matrix of black ankerite. This image is of the type specimen of tischendorffite and the areas of tischendorffite illustrated were used for the characterization study published in Canadian Mineralogist volume 40 page 739 in 2002. Copyright © Natural History Museum - This image is copyrighted. Unauthorized reproduction prohibited. Mineral

Tischendorfite

tischendorfite

Formula
Pd8Hg3Se9
Yellow crystals of tisinalite a mineral that it is only known from Russia, in a contrasting white matrix. From Koashva Mountain, Khibiny Massif, Murmansk Oblast, Russian Federation. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Tisinalite

tisinalite

Formula
Na3H3(Mn,Ca,Fe)TiSi6(O,OH)18 * 2H2O
Back-scattered electron images of tissintite occurs in maskelynite adjacent to shock-melt veins. Most of them grow on the mineral fragments in the maskelynite. Tro: troilite; Tst: tissintite; Msk: maskelynite; opx: orthopyroxene; aug: augite. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Tissintite

tissintite

Formula
(Ca,Na,☐)AlSi2O6
SEM BSE images showing kaitianite (Ktn) with tistarite (Tta), Ti,Al,Zr-oxide (TAZ), MgTi3+2Al4SiO12 phase (MTAS), spinel (Spl), sapphirine (Spr), and Ti-sulfide (Ti-S) in corundum Grain 1125C2. The upper rectangular area in (b) are enlarged in (c). The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Tistarite

tistarite

Formula
Ti2O3
This sample contains large crystals of black titanite, orange feldspar, and rusty red quartz. Titanite, also called sphene, has composition CaTiSiO5. It is a very common accessory mineral in igneous (and often other) rocks, but may be overlooked due to small grain size. Titanite can be green, yellow, white, brown or black; when crystals are large, they are most commonly black. Transparent/translucent samples of titanite show great fire, greater than diamond, and are sometimes used as gemstones. But titanite's hardness is only 5-5.5, so it is not a durable gem. This specimen is about 10 cm across. Mineral

Titanite

titanite

Formula
CaTiSiO5
:Great nugget 0.55 mm long of pure, analyticaly confirmed by microprobe native TITANIUM composed by its sceletal crystals (dendrites) from the First scoria cone, Northern Breakthrough, Great Fissure Eruption, Tolbachik volcano, Kamchatka peninsula Russian Federation. Titanium is, without any doubt, one of the rarest native elements ever discovered, and a treasure for collectors of Group I Elements. This is part of material described in the article Glavatskih S.F., Gorshkov A.I., e.a. (1992) Natural analogue of α-Titanium in exhalations products of Big Fissure Tolbachik Eruption (Kamchatka). Doklady RAN, 327, №1, pp. 126-130 (in Russian). Analysed with SEM and EDX spectrum, performed by Pavel Kartashov. Mineral

Titanium (Native)

titanium (native)

Formula
Ti
Mineral

Titanoholtite

titanoholtite

Formula
(Ti0.75☐0.25)Al6BSi3O18
Mineral

Titanomaghemite

titanomaghemite

Formula
Fe(Fe,Ti)2O4
Black sharp crystals of titanowodginite associated to white beryl from the type locality for the first mineral: Tanco Mine, Bernic Lake, Lac-du-Bonnet, Manitoba, Canada. Mineral

Titanowodginite

titanowodginite

Formula
Mn²⁺TiTa2O8
Titantaramellite Locality: Big Creek, Rush Creek deposit, Big Creek-Rush Creek District, Fresno Co., California, USA Field of view 6 mm. Specimen and photo Leon Hupperichs. Mineral

Titantaramellite

titantaramellite

Formula
Ba4(Ti,Fe³⁺,Fe²⁺,Mg)4(B2Si8O27)O2Clx
Mineral

Tivanite

tivanite

Formula
V³⁺TiO3(OH)
Tlalocite Locality: Bambollita Mine (Oriental Mine), Moctezuma, Mun. de Moctezuma, Sonora, Mexico Picture width 3 mm. Collection and photograph Christian Rewitzer This Photo was Mindat.org Photo of the Day - 6th Oct 2008 Mineral

Tlalocite

tlalocite

Formula
Cu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl·27H2O
Tlapallite Locality: Bambollita mine (La Oriental), Moctezuma, Municipio de Moctezuma, Sonora, Mexico Image width: 29 mm Collection and photograph by Matthijs Hellinghuizen Mineral

Tlapallite

tlapallite

Formula
(Ca,Pb)3CaCu6[Te4+3Te6+O12]2(Te4+O3)2(SO4)2·3H2O
White massive aggregates of the rare mineral tobelite from the type locality in Japan: Ohgidani deposit (Ogidani; Ougidani), Tobe, Ehime, Shikoku Island, Japan. Mineral

Tobelite

tobelite

Formula
(NH4,K)Al2(AlSi3O10)(OH)2
Tobermorite Weight: 38 g Locality: Wessels Mine, Hotazel, Kalahari Manganese Field, South Africa Mineral

Tobermorite

tobermorite

Formula
Ca4Si6O17(H2O)2·(Ca·3H2O
Outstanding sharp bronze tochilinite crystals from Cornwall Mines, Lebanon County, Pennsylvania, United States of America. Mineral

Tochilinite

tochilinite

Formula
Fe²⁺5-6(Mg,Fe²⁺)5S6(OH)10