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Munich Show 2011/10/30: a nice thalénite-(Y) crystal embedded in hosting REE-enriched granitic pegmatite; specimen ca. 8 x 7 x 7cm; diameter/length of crystal ca. 1.8 cm. From: Hundholmen, Tysfjord, Nordland, Norway. Mineral

Thalénite-(Y)

thalénite-(Y)

Formula
Y3Si3O10F
Thaumasite Locality: N'Chwaning II Mine, N'Chwaning Mines, Kuruman, Kalahari manganese fields, Northern Cape Province, South Africa (Locality at mindat.org) Size: miniature, 3.1 x 2.1 x 1.9 cm Thaumasite A fine specimen with gem crystals, on matrix, from a surprising and small find of late 2005. These are the best seen in 20 years, of this rare gem species related to ettringite and sturmanite. And, they happen to be beautiful. In person, there is more lustre. Mineral

Thaumasite

thaumasite

Formula
Ca3Si(OH)6(SO4)(CO3)·12H2O
Mineral

Thebaite-(Nh4)

thebaite-(NH4)
Theisite, Azurite Locality: Johann adit, Geyer - Silberberg District, Brixlegg - Rattenberg, Brixlegg - Schwaz area, Inn valley, North Tyrol, Tyrol, Austria (Locality at mindat.org) Size: 3.2 x 2.2 x 1.8 cm. A very rare old classic of this copper/zinc arsenate, from an old location that is probably where it was first found, but not first recognized as a new species from. The theisite is the chatoyant, deep green material you can see around the rim of the pocket, lined with a secondary growth of the same or perhaps of malachite, and on which small azurite blades perch. This piece is probably 120-160 years old. Ex. Eric Asselborn Collection. Mineral

Theisite

theisite

Formula
Cu5Zn5(AsO4,SbO4)2(OH)14
Mineral

Theoparacelsite

theoparacelsite

Formula
Cu3(As2O7)(OH)2
Platy pale green crystals of the extremely rare nickel mineral theophrastite from the famous Lord Brassey mine (Heazlewood District, Tasmania, Australia), known for its paragenesis of nickel minerals. Ex- collection Chris Deroo and ex-collection Rik Dillen. Mineral

Theophrastite

theophrastite

Formula
Ni(OH)2
Dark brown perfect crystals of the extremely rare new mineral therasiaite (IMA 2013-050) from the famous locality La Fossa Crater (Vulcano Island, Aeolian Islands, Sicily, Italy), on adranosite crystals. Formula: (NH4)3KNa2Fe2+Fe3+(SO4)3Cl5. The sample is completely sealed in nitrogen atmosphere, so it is perfectly stable. It is a one locality mineral worldwide, and in La Fossa Crater only a few specimens have been found, so it is a very sought after mineral!. The photo have been made through the plasticbox, so quality is not very high. Mineral

Therasiaite

therasiaite

Formula
(NH4)3KNa2Fe²⁺Fe³⁺(SO4)3Cl5
Abundant small brown crystals of thermaerogenite on white aphthitalite and iron-black hematite and tenorite. Field width: 3.5 mm. Mineral

Thermaerogenite

thermaerogenite

Formula
CuAl2O4
Sharp colorless crystals of the rare mineral thermassaite from the famous La Fossa Crater locality in Eolian Islands (Sicily, Italy). Mineral

Thermessaite

thermessaite

Formula
K2AlF3(SO4)
Thermessaite-(NH₄) - Italy, Sicily, Lipari, Vulcano Island, La Fossa Crater (TL) - 0,3 mm Photos from tomeikminerals.com can be used under a Creative Commons Licenese 4.0 CC-BY, as explained in: https://www.tomeikminerals.com/about-me. Mineral

Thermessaite-(Nh4)

thermessaite-(NH4)

Formula
(NH4)2AlF3(SO4)
Villiaumite. Are these “real” crystals or cleavages? The powdery coating (thermonatrite per the label but not analyzed) suggests that these are actual xls. But it’s hard to be sure with villiaumite so I make no claims. - Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada - FOV 4.5 x 6.7 mm Mineral

Thermonatrite

thermonatrite

Formula
Na2CO3·H2O
Figure 1. Theuerdankite (1) from the type locality associated with native silver (2) and chlorargyrite (3) in the cavity of strongly supergene-weathered material; Field of view: 3.6 mm; holotype specimen (P1P 59/2022); photo M. Gross. Mineral

Theuerdankite

theuerdankite

Formula
Ag3AsO4
Mineral

Thionasilite

thionasilite

Formula
Na2Si2S2O3
Thomasclarkite-(Y) Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry), Mont Saint-Hilaire, Rouville RCM, Montérégie, Québec, Canada (Locality at mindat.org) Field of view 4 mm. Specimen and photo Leon Hupperichs. Mineral

Thomasclarkite-(Y)

thomasclarkite-(Y)

Formula
(Na,Ce)(Y,REE)(HCO3)(OH)3·4H2O
Thometzekite is an extremely rare mineral from Tsumeb, its type locality, and labeled as RRR in Gebhard Tsumeb book (single occurrence with less than 10 specimens) and present here as yellowish crystal aggregates in arsentsumebite matrix. The specimen has been analyzed by SEM/EDX. Mineral

Thometzekite

thometzekite

Formula
PbCu²⁺2(AsO4)2·2H2O
Thomsenolite "obelisks" with a few pseudo cubic ralstonite (top center cluster). Thomsenolite can look cubic as well but the labels says "ralstonite" and it would be suprising to have both habits in one cluster. In any case, the rest of the specimen has plenty of ralstonite. - Locality: Ivittuut (Ivigtut), Arsuk Firth, Arsuk, Kitaa (West Greenland) Province, Greenland - FOV: 2.4 x 3.0 mm Mineral

Thomsenolite

thomsenolite

Formula
NaCaAlF6·H2O
Thomsonite-Ca Locality: Amudikha River, Nizhnyaya Tunguska River Basin (Lower Tunguska River), Evenkia (Evenkiyskiy Autonomous okrug), Krasnoyarsk Territory (Krasnoyarsk Kray; Krasnoyarskii Krai), Eastern-Siberian Region, Russia (Locality at mindat.org) Size: 4.2 x 3 x 3 cm. Very rare, exceptional specimen of well-crystallized Thomsonite. The crystals are translucent to gemmy, have very good luster, and occur in dozens of platy fans (sprays) about .5 cm long. In discrete crystals like this, Thompsonite is very rare. This is old material from the Fersman Museum of Moscow. Mineral

Thomsonite-Ca

thomsonite-Ca

Formula
NaCa2(Al5Si5)O20·6H2O
Thomsonite Locality: Malad, Ward 38, Mumbai (Bombay), Mumbai District (Bombay District), Maharashtra, India (Locality at mindat.org) At first, nobody could believe these were thomsonites when they appeared at the Tucson show earlier this year – they were being sold as something else until “the” expert on zeolites identified them for what they were right there at the show – the biggest and richest thomsonites the world has ever seen! Then there was a mad rush to buy them, of course. Not all are so beautiful, but a few have the gorgeous aesthetics of this one, with a huge, perfect ball measuring 4 cm centred on the sparing matrix, surrounded by smaller balls. 9 x 6.5 x 2.8 cm Mineral

Thomsonite-Sr

thomsonite-Sr

Formula
NaSr2Al5Si5O20·(6-7)H2O
Mineral

Thorasphite

thorasphite

Formula
Th2H(PO4,AsO4)3·6H2O
Thorbastnäsite, Albite (FOV 1.3 mm x 1.9 mm) Locality: Poudrette quarry (Demix quarry; Uni-Mix quarry; Desourdy quarry; Carrière Mont Saint-Hilaire), Mont Saint-Hilaire, La Vallée-du-Richelieu RCM, Montérégie, Québec, Canada Description: Thanks to Marc F. Analyzed find. Stereo pair (not very clear in mono). MOB coll. It has been claimed that this is really röntgenite with thorbastnäsite but the analysis label (see child photo) only mentions the latter. (And there are those who claim that röntgenite is a bit like cold fusion. Beyond my ken ...) The tiny black things look like pseudo-octahedral brookite (similar to Dana 3rd ed. fig. 726). But too small to be sure. Mineral

Thorbastnäsite

thorbastnäsite

Formula
ThCa(CO3)2F2·3H2O
Sample of the mineral Thoreaulite, held in the Harvard Museum of Natural History Mineral

Thoreaulite

thoreaulite

Formula
(Sn²⁺,Pb)(Ta,Nb)2O6
Thorianite Locality: Ambatofotsy pegmatite, Mahavelona Commune, Soavinandriana District, Itasy Region, Antananarivo Province, Madagascar (Locality at mindat.org) A very aesthetic cluster of four, lustrous, black, interpenetrating twinned thorite crystals from Ambatofotsy, Madagascar. All of the crystals are undamaged. This is of SUPERB quality. 1.6 x 1.4 x 1.3 cm [NOTE: The locality of this specimen has been questioned, see http://www.mindat.org/mesg-7-35240.html] Mineral

Thorianite

thorianite

Formula
ThO2
Very pale yellow crystals of the rare mineral thorikosite from the type locality in Lavrion: Passa Limani Cove, Lavrion, Attiki Prefecture, Greece. Thorikosite has been found in only 3-4 localities worldwide. Mineral

Thorikosite

thorikosite

Formula
Pb3Cl2(OH)(SbO3,AsO3)
Thorite Locality: Kemp prospect (Kemp property; Kemp uranium mine), Cardiff Township, Haliburton County, Ontario, Canada (Locality at mindat.org) Size: 2.2 x 2.2 x 1.6 cm. A sharp, euhedral, pristine, rust-brown thorite crystal from the less well-known Kemp Uranium Mine in Cheddar, Ontario, Canada. This floater is remarkable for the size. It dates to the 1950s. Good thorite specimens are nearly impossible to obtain today, and specimens from Cheddar rank among the best ever found. Ex. George Elling Collection. Mineral

Thorite

thorite

Formula
ThSiO4