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Minerals

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Whitish and yellowish crystals of the very rare yttrium mineral tveitite-(Y) from a locality in Russia (Rovgora Mountain, Western Keivy Massif, Keivy Mountains, Murmansk Oblast, Russian Federation). Ex. Erich Laskowski collection (USA). Mineral

Tveitite-(Y)

tveitite-(Y)

Formula
(Y,Na)6Ca6Ca6F42
Tvrdýite Field of view: 5 mm Locality: Hagendorf South Pegmatite, Hagendorf, Waidhaus, Neustadt an der Waldnaab District, Upper Palatinate, Bavaria, Germany (locality at mindat.org) Mineral

Tvrdýite

tvrdýite

Formula
Fe²⁺Fe³⁺2Al3(PO4)4(OH)5(H2O)4·2H2O
Very small but sharp crystal of the extremely rare mineral tweddillite from the type locality in Wessels mine (North Cape Province, South Africa). Tweddillite is one of the rarest minerals from Wessels mine and it is very rarely seen in the systematic mineral market. Mineral

Tweddillite

tweddillite

Formula
CaSr(Mn³⁺2Al)[Si2O7][SiO4]O(OH)
Mineral

Twinnite

twinnite

Formula
Pb0.8Tl0.1Sb1.3As0.8S4
Perfect sharp colorless single crystal of the rare Na-Mg mineral tychite from the TL in California (Searles Lake, San Bernardino County, California, United States of America). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Tychite

tychite

Formula
Na6Mg2(CO3)4(SO4)
Whitish-yellow crystals of the rare borate mineral tyretskite from the second known locality worldwide: Inder B Deposit, Atyrau, Atyrau Oblysy, Kazakhstan. Mineral

Tyretskite

tyretskite

Formula
Ca2B5O9OH·H2O
Mineraly.sk - tirolit Mineral

Tyrolite

tyrolite

Formula
Ca2Cu9(AsO4)4(CO3)(OH)8·11H2O
Tyrrellite, Chalcomenite, Umangite Locality: Eagle Claims U-Cu-Se occurrence (Hal Lake occurrence), Beaverlodge Lake area, Saskatchewan, Canada Size: 1.4 cm x 1.1 cm x 0.6 cm Tyrrellite is a very rare Cu-Co-Ni selenide and this colorful combination selenide thumbnail is from the obscure Co-type Locality. Specimens from here are rare and are very seldom available. Small patches of bronze-colored tyrrellite are noted on both sides of the matrix along with much bright blue chalcomenite and scattered grains of bluish red-black umangite. Fine and rare combination material from the Art Soregaroli Collection Mineral

Tyrrellite

tyrrellite

Formula
Cu(Co,Ni)2Se4
Tyuyamunite — (Carnotite) Locality: Marie Mine, Pryor Mountains, Carbon County, Montana, USA. (Locality at mindat.org) Size: 6.4 x 2.4 x 1.9 cm. Small, intense yellow crystal rosettes isolated on matrix. Mineral

Tyuyamunite

tyuyamunite

Formula
Ca(UO2)2(VO4)2·5-8H2O
Mineral

Tzeferisite

tzeferisite

Formula
CaZn8(SO4)2(OH)12Cl2(H2O)9
Törnebohmite-(Ce), Allanite-(Ce) Locality: Jamestown District, Boulder County, Colorado, USA (Locality at mindat.org) Size: 6.5 x 3.8 x 2.5 cm. This specimen was collected by Richard Kosnar on April 15, 1973 in the famous Jamestown District of Colorado which is northwest of Boulder. This pegmatite region has produced some very good specimens of a few species, such as Törnebohmite-(Ce). This specimen hosts a "vein" of grey color Törnebohmite-(Ce) which is wedged between dark (nearly black) bands of Allanite-(Ce) on K-Feldspar matrix. The specimen was reportedly analyzed by Hal Miller in 1974. Hal Miller was the co-author of the famous "Colorado Mineral Belt" article in the November/December 1976 Issue of the Mineralogical Record. A great association specimen combining a pair of rare-earth species from this classic Colorado locality. Ex. Richard Kosnar Collection. Mineral

Törnebohmite-(Ce)

törnebohmite-(Ce)

Formula
Ce2Al(SiO4)2(OH)
Mineral

Törnebohmite-(La)

törnebohmite-(La)

Formula
La2Al(SiO4)2(OH)
Mineral

Törnroosite

törnroosite

Formula
Pd11As2Te2
Uakitite in troilite–daubréelite ± schreibersite globules in Fe-Ni-metal (kamacite), Uakit meteorite (IIAB), BSE images. Symbols: VN-1–VN-4—uakitite (see also Figure 4); Dbr—daubréelite; Tro—troilite; Sch—schreibersite; Mgt—magnetite; Kmc—kamacite, Pn—pentlandite; Hz—heazlewoodite; Gro—grokhovkyite CuCrS2. Mineral

Uakitite

uakitite

Formula
VN
Metallic crystals of the extremely rare mineral uchucchacuaite in matrix. Uchucchacuaite in visible crystals is a very sought after mineral. Probably from the type locality at Uchucchacua Mine, although the label accompanying the specimen indicates the locality to be "Orcopampa, Peru" (Orcopampa District, Arequipa Department, Peru). Specimen formerly in the collection of Dr. Wilke (1984). Mineral

Uchucchacuaite

uchucchacuaite

Formula
AgMnPb3Sb5S12
(Figure 2) Abundant skeletal, case-like coarse crystals of udinaite (light grey) embedded in anhydrite (dark grey matrix). Polished section, SEM (BSE) image. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). Mineral

Udinaite

udinaite

Formula
NaMg4(VO4)3
Mineral

Uduminelite

uduminelite

Formula
Ca3Al8(PO4)2O12·2H2O
Uedaite exhibited at the Mining Museum of Akita University Mineral

Uedaite-(Ce)

uedaite-(Ce)

Formula
Mn²⁺CeAl2Fe²⁺(Si2O7)(SiO4)O(OH)
Mineral

Uklonskovite

uklonskovite

Formula
NaMg(SO4)F·2H2O
Ulexite Locality: Boron, Kramer District, Kern County, California, USA (Locality at mindat.org) This is a great example of the transparent and colorless mineral known as "TV rock" because it has optical properties like fiber-optic cable. It is transparent along the perfect vertical axis, while opaque along other axes. When polished, as this is, you can hold it over writing and witness this phenomenon. Is this a fine mineral specimen? No, not really. But it is really "neat" material and I wasn't sure those outside of California had been exposed to it. It does get sold widely to museums and rock shops, again labelled as "tv rock" or "fiber-optic rock". Fun for kids... 4.3 x 3.1 x 1.9 cm Mineral

Ulexite

ulexite

Formula
NaCaB5O6(OH)6·5H2O
Mineral

Ulfanderssonite-(Ce)

ulfanderssonite-(Ce)

Formula
(Ce15Ca)∑16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3
Ullmannite Locality: Masaloni Mine, San Vito, Cagliari Province, Sardinia, Italy (Locality at mindat.org) Size: 5.4 x 3.3 x 2.1 cm. This superb rarity features SHARP and LUSTROUS crystals to a full centimeter, perched up in a mound to make for a very attractive specimen of this usually not very attractive species. Sarrabus is a very important, ancient silver district. Ullmannites are one of those rare bystanders that so sadly, few were saved of. What is amazing about this specimen is that the piece actually has some display aesthetics whereas most are embedded in massive, ugly ore. From the collection of Gianguido Giannobi. Mineral

Ullmannite

ullmannite

Formula
NiSbS
Light green needles of ulrichite from the type locality Lake Boga, Australia (width of the crystal aggregate: 1 mm) Mineral

Ulrichite

ulrichite

Formula
CaCu(UO2)(PO4)2·4H2O
Ulvöspinel Locality: Apollo 12 landing site, Oceanus Procellarum (Ocean of Storms), The Moon Euhedral ulvöspinel with an exsolution of ilmenite. Reflected light photo. Public domain image courtesy of NASA. (NASA Lunar Petrographic Educational Thin Section Set, C Meyer - 2003) Mineral

Ulvöspinel

ulvöspinel

Formula
Fe²⁺2TiO4