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Outstanding yellow crystals of the very rare lead mineral trigonite from the type and only known locality worldwide, the famous Langban deposit. This is one of the most sought-after, well crystallized rarities from the famous Langban Mine in Sweden. The mineral was exclusively found within the so-called Hindenburg working of the mine. Mineral

Trigonite

trigonite

Formula
Pb3Mn²⁺(As³⁺O3)2(As³⁺O2OH)
Mineral

Trikalsilite

trikalsilite

Formula
K2NaAl3(SiO4)3
Mineral

Trilithionite

trilithionite

Formula
K(Li1.5Al1.5)(AlSi3O10)(F,OH)2
Locality: Långban, Filipstad, Värmland, Sweden Dimensions: 7.0 cm x 6.0 cm x 2.5 cm A very good example of this rare calcium manganese beryllium silicate. Trimerite occurs as subhedral, prismatic, yellow-orange crystals to 3mm along the margin of a calcite veinlet in manganite ore. The largest and most significant, nearly complete crystal (3 mm) is marked with a red arrow. From Langban, Filipstad, Varmland, Sweden. Ex. Swedish Natural History Museum collection with label. Mineral

Trimerite

trimerite

Formula
CaBe3Mn²⁺2(SiO4)3
Mineral

Trimounsite-(Y)

trimounsite-(Y)

Formula
Y2Ti2(SiO4)O5
White crystals of trinepheline associated to fabriesite and jadeite from Myanmar (Tawmaw, Hpakant Township, Mohnyin District, Kachin State, Myanmar). Ex. Erich Laskowski collection (USA). Mineral

Trinepheline

trinepheline

Formula
NaAlSiO4
Triphylite Locality: G. E. Smith Quarry (Chandler Mills Quarry), Newport, Sullivan County, New Hampshire, USA (Locality at mindat.org) A supreb 2 x 1.7 x 1.3 cm triphyllite crystal, complete all around. It has a slightly purpley color to it, and has sharp faces. In prepping this piece, I noted what may be one repair at the contact to the matrix. The repair is, truthfully though, very hard to notice...just being on the safe side. In any case, its a superb example both for the specie sand the locality. An old "FP" tape on the back denotes it was from the Fred Pough Collection 6.5 x 4.3 x 2.5 cm Mineral

Triphylite

triphylite

Formula
LiFe²⁺PO4
Triplite Locality: Alchuri (Alchori; Aschudi), Shigar Valley, Skardu District, Baltistan, Northern Areas, Pakistan (Locality at mindat.org) Size: thumbnail, 1.2 x 1 x 0.9 cm Triplite This was, to me, one of the most startling and exciting new finds of the show even if both the find and its audience are admittedly very small. Triplite is an EXTREMELY rare manganese/iron phosphate that has not been previously reported as being from Pakistan. Crystals are simply unavailable and crystals of beauty unprecedented. This small parcel turned up just ahead of the show, and was XRAYED at both the Smithsonian and the GIA (Gem Institute of America). As there were very few crystals in the lot, it was basically gem rough and most of it was then promptly cut into gemstones just before the show, because of the shocking color for the colored stone collectors. This etched crystal is one of just a very few pieces from the find that I am aware of, that makes for a specimen-quality example. I believe this find will remain as rare, if not more so, than the vaerynynites which come from the same region and command such a premium. In fact, if this were vaerynynites , because i suppose the name is so much more recognizable as one of those "holy grails" of rare pakistani species, it would paradoxically be worth more - but triplite in this quality is definitely the rarer of the two. 1.2 x 1 x 0.9 cm Mineral

Triplite

triplite

Formula
Mn²⁺2PO4F
Triploidite Locality: Abija N. Fillow Quarry (Branchville Quarry), Branchville, Redding, Fairfield County, Connecticut, USA (Locality at mindat.org) Size: 7.0 x 4.8 x 2.6 cm. A rare phosphate, from the type locality circa late 1800s. The triploidite is the radiating, embedded, marginally crystalline reddish material. From the noted collection of William Drown who, according to the Mineralogical Record Archive on him, was an umbrella manufacturer who used his fortune to amass a collection of some 6000 mineral specimens. His collection was kept by his family for a generation after his death and then donated in 1918. Ex. Philadelphia Academy of Sciences Collection. Mineral

Triploidite

triploidite

Formula
(Mn²⁺,Fe²⁺)2(PO4)(OH)
Mineral

Trippkeite

trippkeite

Formula
Cu²⁺As³⁺2O4
Green tripuhyite (a rare Sb-Fe oxide) associated to sharp colorless valentinite crystals from this classic Italian locality: Tafone Mine, Grosseto Province, Tuscany, Italy. Mineral

Tripuhyite

tripuhyite

Formula
Fe³⁺Sb⁵⁺O4
Outstanding yellow orange acicular crystals of the extremely rare uranium mineral tristramite from the TL in Cornwall (Wheal Trewavas, Rinsey, Brea, Cornwall, United Kingdom). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Tristramite

tristramite

Formula
(Ca,U,Fe)(PO4,SO4)·2H2O
Mineral

Tritomite-(Ce)

tritomite-(Ce)

Formula
Ce5(SiO4,BO4)3(OH,O)
Brown resinous crystals of the very rare yttrium mineral tritomite-(Y) from Cardiff Uranium Mine, Cardiff Township, Haliburton County, Ontario, Canada. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Tritomite-(Y)

tritomite-(Y)

Formula
Y5(SiO4,BO4)3(O,OH,F)
Oosterboschite, Trogtalite, Cuprosklodowskite, Quartz Locality: Musonoi Mine, Kolwezi, Kolwezi District, Katanga Copper Crescent, Katanga (Shaba), Democratic Republic of Congo (Zaïre) Size: 4.2 x 2.9 x 2.3 cm Oosterboschite and trogtalite are very rare selenides, with the former having palladium and copper and the latter having cobalt. The famed Musonoi is the Type Locality for Oosterboschite. This piece is from the Howard Belsky Collection, who collected many rare species. We believe the splendent gray crystals on one end surrounded by a green mineral are the oosterboschite. The quartz matrix holds several vugs richly lined with gemmy, green cuprosklowdoskite needles. The brown crystals richly lining one vug could be oxidized trogtalite, as MINDAT lists this species as being rose-violet. X-ray work would be needed to confirm species identifications in a normal case but, as this is from the Belsky Collection, it’s pretty certain to be legitimate. He had his own analytical setup and did much work with friends in museums, specializing in rarities. Mineral

Trogtalite

trogtalite

Formula
CoSe2
Meteorit Sikhote Alin. Scheibe mit Troilit-Einschlüssen, einem rekristallisiertem Rand durch hohe Temperaturen beim Flug durch die Atmosphäre und Neumann-Linien Mineral

Troilite

troilite

Formula
FeS
These mineral images are free to use how you wish. Mineral

Trolleite

trolleite

Formula
Al4(PO4)3(OH)3
Trona Locality: Owens Lake, Owens Valley, Inyo County, California, USA (Locality at mindat.org) Size: 14.4 x 10.8 x 7.8 cm Trona is a rare carbonate found in saline lakes and their evaporites. This is a superb, large example of sugary, translucent, honey-brown crystals of large size. Such specimens from this locale are considered to be the finest examples of the species. From a small find. Ex. Karl Faddis Collection. Mineral

Trona

trona

Formula
Na3(HCO3)(CO3)·2H2O
Outstanding white sharp truscottite crystals with a good contrast with the matrix and from Bras de Cilaos (Cirque de Cilaos, Piton des Neiges, Reunion). Analyzed specimen. Mineral

Truscottite

truscottite

Formula
(Ca,Mn)14Si24O58(OH)8·2H2O
Mineral

Trébeurdenite

trébeurdenite

Formula
Fe²⁺2Fe³⁺4O2(OH)10(CO3)·3H2O
Troegerite from Weisser Hirsch Mine, Saxony, Germany, FOV 5mm Mineral

Trögerite

trögerite

Formula
(H3O)(UO2)(AsO4)·3H2O
Mineral

Trüstedtite

trüstedtite

Formula
Ni3Se4
Mineral

Tsangpoite

tsangpoite

Formula
Ca5(PO4)2(SiO4)
Quartz, Tsaregorodtsevite Locality: Yaruta Mt, Man'-Khambo Mts, Khanty-Mansi (Khanty Mansiysk) Okrug, Polar Urals, Western-Siberian Region, Russia (Locality at mindat.org) Size: small cabinet, 7.7 x 5.5 x 3.8 cm Tsaregorodtsevite on Quartz At 7.5 mm, the larger crystal here is at the maximal size for the species. Tsaregorodtsevite is a VERY STRANGE mineral that is made up of AMMONIA with nitrogen, and an aluminosilicate compound. I recall when Fersman Museum started selling their extras in 1991, this was one of the most coveted of all rare species that came out the doors from their various expeditions. I got some directly at the time from curator Dmitriy Belakovskiy, who has himself been to this remote location on at least one expedition. I assume this specimen came form the same source, the only source so far as I know. In fact, I bought this piece from him at Tucson 2008, surprised to see another turn up after so long. The perch on a quartz cluster makes the display here particularly good - usually these are on flat gray rocks. (TYPE and ONLY LOCALITY) Mineral

Tsaregorodtsevite

tsaregorodtsevite

Formula
(N(CH3)4)(AlSi5O12)