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A backscattered electron image (BSE) showing a rounded, subhedral grain of iridium enriched in Os (labeled Ir-Os) which hosts globular or elongate inclusions of PGE- and base-metal sulfides (gray in the BSE) from the River Ko placer. An intermediate member of the ferrotorryweiserite–torryweiserite series (labeled Ftyw) occurs as a portion of a composite and partial rim deposited around an olivine-plagioclase core (dark gray in the BSE), which includes skeletal forms of titaniferous augite. The host is epoxy. 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

Torryweiserite

torryweiserite
Orthoclase, Tosudite Locality: Schori, Wallis, Switzerland Size: thumbnail, 3 x 2.5 x 2.2 cm Adularia w/Chlorite Very sharp interpenetrating twinned crystals that are gemmy and have an attractive coating of Chlorite on most of the surfaces. Even so, the luster on this superb thumb is excellent. 3 x 2.5 x 2.2 cm Mineral

Tosudite

tosudite

Formula
Na0.5(Al,Mg)6((Si,Al)8O18)(OH)12·5H2O
Mineral

Toturite

toturite

Formula
Ca3Sn2(SiFe³⁺2)O12
Bluish-green tounkite with bright sulphur-yellow bystrite and blue lazurite in white calcite matrix from the type locality for both species (Malo-Bystrinskoe, Malaya Bystraya River Valley, Lake Baikal, Irkutsk Oblast, Russian Federation). Bystrite and tounkite are very rare silicates. Ex. Erich Laskowski collection (USA). Mineral

Tounkite

tounkite

Formula
(Na,Ca,K)8(Al6Si6O24)(SO4)2Cl·0.5H2O
Este ejemplar se corresponde a una nueva especie recién descubierta en las pegmatitas de Madagascar. Se trata de un borato de berilio, litio y aluminio LiAl₄Be₄(B₁₁Be)O₂₈. El ejemplar que ofrecemos muestra diversos cristales con formas dodecaédricas, muy brillantes y con el color blanco lechoso característico. Una pieza de primera calidad, de buen tamaño y con cristales bien definidos. Esta nueva especie puede ser confundida con otros minerales como la londonita o la rodizita, que también se encuentran en esta pegmatita. Hemos realizado análisis de estos cristales mediante microscopía electrónica lo que nos permite detectar la presencia de K y Cs, pero en pequeñas cantidades y acorde con los resultados analíticos empíricos de las muestras estudiadas para determinar la especie. Pueden ver el abstract de la publicación previa de Hatert. F. et al en The Canadian Journal of Mineralogy and Petrology (2025) 63 (6): 867–878. https://doi.org/10.3749/250007. Medidas: 5.8 x 5.6 x 2.5 cm. Cristal principal: 3.5 mm. Encontrado en 2025. Ejemplar con análisis Mineral

Touretite

touretite

Formula
LiAl4Be4(B11Be)O28
File name: 07_11_000828 Title: Minerals Creator/Contributor: L. Prang & Co. (publisher) Date issued: 1861-1897 (approximate) Copyright date: Physical description note: Proof print Genre: Chromolithographs; Illustrations; Proofs Notes: Title supplied by cataloger. Location: Boston Public Library, Print Department Rights: No known restrictions Flickr data on 2011-08-05: Camera: Sinar AG Sinarback 54 FW, Sinar m License: CC BY 2.0 User: Boston Public Library BPL Mineral

Tourmaline

Formula
Complex borosilicate
Mohs
7–7.5
Colour
Many colours
Mineral

Townendite

townendite

Formula
Na8ZrSi6O18
Toyohaite Locality: Pirquitas Ag-Sn Deposit, Rinconada Department, Jujuy, Argentina (Locality at mindat.org) Size: small cabinet, 7.1 x 5.6 x 3.4 cm Toyohaite ex. Dr. Werner Paar Collection TOYOHAITE, in xls (!!) is super-rare. This specimen features a huge 1mm EYE-VISIBLE crystals, clearly contrasted upon the sparkling sulfide matrix. Although not richly covered, this is a fantastic example for the species as it is so easily seen. They are not readily eye-visible in these photos, but there are many seen with a loupe and in person looking into the cavity (hence the price). It has a display quality, that is nice. All crystals are nicely protected in a shallow cavity, as well. This is the Ag-rich end member of the rhodostannite-toyohaite solid solution series. A very rare mineral originally described from the Toyoha mine in Japan where it occurred in microscopic grains only. For the first time, the new occurrence in Argentina provides large xls of this species (+/- 1 mm) grown on franckeite-potosiite, and associated with other rare minerals like pirquitasite, cylindrite and fizelyite-ramdohrite. The mineral has a "pseudo-cubic" shape and looks like pyrrhotite. Only very few specimens with xls were recovered, and chances to find additional material are almost none. A "must" for any collector of rare Ag minerals. The mineral was microprobed and almost exaxctly correponds to the end member composition Mineral

Toyohaite

toyohaite

Formula
Ag2FeSn3S8
Mineral

Trabzonite

trabzonite

Formula
Ca4(Si3O9)(OH)2
Mineral

Tranquillityite

tranquillityite

Formula
(Fe²⁺,Ca)8(Zr,Y)2Ti3(SiO4)3O12
Mineral

Transjordanite

transjordanite

Formula
Ni2P
Traskite (brown) and Kampfite (bluish), from Big Creek, Fresno County, California, United States of America Mineral

Traskite

traskite

Formula
Ba21Ca(Fe²⁺,Mn,Ti)4(Ti,Fe,Mg)12(Si12O36)(Si2O7)6(O,OH)30Cl6·14H2O
Mineral

Trattnerite

trattnerite

Formula
☐(Fe³⁺,Mg,Fe²⁺)2(Mg,Fe²⁺,Fe³⁺)3(Si12O30)
Black metallic crystals of the very rare Ag-Pb-Bi sulphide mineral treasurite from one of the few known localities worldwide (Tyrone Mine, Burro Mountains, Grant County, New Mexico, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Treasurite

treasurite

Formula
Ag7Pb6Bi15S30
Mineral

Trebiskyite

trebiskyite

Formula
Na3Mg2[TiV9O28]·22H2O
Deep red trechmannite associated to minoritary realgar and pyrite. From a 1992 find. Analyzed with EDS. From: Lengenbach Quarry, Binntal, Wallis, Switzerland. Mineral

Trechmannite

trechmannite

Formula
AgAsS2
Mineral

Tredouxite

tredouxite

Formula
NiSb2O6
Mineral

Trembathite

trembathite

Formula
(Mg,Fe)3(B7O13)Cl
Tremolite Locality : Campolungo, Piumogna Valley, Leventina, Ticino (Tessin), Switzerland -TOPOTYPE Size : 14x6.4cm Mineral

Tremolite

tremolite

Formula
☐Ca2Mg5Si8O22(OH)2
Trevorite, Népouite Locality: Musongati (Musongoti; Colline Musongati), Rutana Province, Burundi Dimensions: 6.2 cm × 3.6 cm × 2.4 cm Trevorite is a very rare iron-rich Spinel Group species and garnierite is a synonym of nepouite, a rare Serpentine Group species. This very rare combination piece is certainly from a most obscure locale and country - Burundi. Musongati is a nickel, cobalt, copper lateritic deposit over a flat-lying, layered intrusion of gabbro, norite, and other mafic-ultramafic rocks (MINDAT). Pale green nepouite appears to be far richer on this specimen, than the black with a green or brown tint trevorite. It's hard to distinquish the two. There are also crusts of a splendent metallic mineral. The colors are far brighter on the back edge of the piece. Probably older material, but no proof. Ex. Jacques Montandon Collection. Mineral

Trevorite

trevorite

Formula
NiFe³⁺2O4
Outstanding yellow crystal aggregates of the very rare uranium mineral triangulite in a contrasting matrix. From Rhyolite Ridge, Cave Springs, Esmeralda County, Nevada, United States of America. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Triangulite

triangulite

Formula
Al3(UO2)4(PO4)4(OH)5·5H2O
Outstanding deep blue acicular crystals of triazolite (IMA 2017-025) associated to pale blue salmiac. Triazolite has only been found in one locality worldwide: Pabellon de Pica, Chanabaya, Iquique Province, Tarapacá Region, Chile. The second natural (mineral) triazolate to be discovered. It is a metalorganic ammine complex in which 1,2,4-triazolate anion and ammonia molecule are ligands coordinating Cu2+. Mineral

Triazolite

triazolite

Formula
NaCu2(N3C2H2)2(NH3)2Cl3·4H2O
A common form of Tridymite, ultra thin colorless tabulars (image width: 1,1 mm) - Locality: Wannenköpfe, Ochtendung, Eifel region, Germany Mineral

Tridymite

tridymite

Formula
SiO2
Mineral

Trigodomeykite

trigodomeykite

Formula
Cu3As