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Uranospinite, Walpurgite Locality: Walpurgis Flacher vein, Weißer Hirsch Mine (Shaft 3), Neustädtel, Schneeberg District, Erzgebirge, Saxony, Germany (Locality at mindat.org) Size: thumbnail, 1 x 1 cm Walpurgite with Uranospinite It is VERY probable that this specimen is from the type find of the species (of both of them, for that matter) in the 1870s, as it soon after found its way to the collection of Clarence Bement by the late 1800s and he had many contacts to send him superb examples of new species. Even after, this notable old find was not surpassed in quality, although a few later pockets were found over the years. A Walpugis specimen today on the market is EXTREMELY rare and I have seen but a handful (and bought up every one). This specimen contains crystals of bright yellow walpurgite showing sharp crystal form (distinguishing them from a later find of richer coverage, but smaller XL size), mixed with bright green plates of uranospinite. Zeunerite is also in association as is some minor torbernite. Comes in Bement's ORIGINAL cardboard micromount box, dating to the late 1800s! This specimen was preserved in the Harvard museum collection, from which I obtained it by exchange. (TYPE LOCALITY for BOTH SPECIES). Mineral

Uranospinite

uranospinite

Formula
Ca(UO2)2(AsO4)2·10H2O
Uranotungstite Locality: Krunkelbach Valley Uranium deposit, Menzenschwand, Black Forest, Baden-Württemberg, Germany Yellow-orange aggregates of uranotungstite (analysed). Field of view 3 mm. Specimen and photo Leon Hupperichs. Mineral

Uranotungstite

uranotungstite

Formula
Fe(UO2)2(WO4)(OH)4·12H2O
Outstanding white and yellowish acicular and hairy crystals of the extremely rare organic mineral urea (CO(NH2)2) from one of the few known localities worldwide (Planet Mine, Planet, La Paz County, Arizona, United States of America). Very rich specimen for the quantity of urea present. Ex. Erich Laskowski collection (USA). Mineral

Urea

urea

Formula
CO(NH2)2
Mineral

Uricite

uricite

Formula
C5H4N4O3
Mineral

Uroxite

uroxite

Formula
[(UO2)2(C2O4)(OH)2(H2O)2]·H2O
(a) Numerous small brown crystals of thermaerogenite on colourless to white langbeinite with light blue urusovite, iron-black tenorite and minor green ericlaxmanite. Field width: 2.2 mm. (b) Abundant small brown crystals of thermaerogenite on white aphthitalite and iron-black hematite and tenorite. Field width: 3.5 mm. (c) Small brown crystals of thermaerogenite on colourless calciolangbeinite iron-black tenorite, light blue urusovite and green kozyrevskite. Field width: 0.8 mm. Mineral

Urusovite

urusovite

Formula
CuAlO(AsO4)
Metallic inclusions of the two extremely rare palladium-bismuth minerals urvantsevite & froodite from the famous Talnakh deposit (Mayak Mine, Talnakh, Noril'sk, Putoran Plateau, Taimyr Peninsula, Krasnoyarsk Krai, Russian Federation) in a completely analyzed specimen by SEM/EdS. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Urvantsevite

urvantsevite

Formula
Pd(Bi,Pb)2
Mineral

Usagreite

usagreite

Formula
[Hg²⁺3S2](SO4)
Locality: João Firmino claim, Linópolis, Divino das Laranjeiras, Doce valley, Minas Gerais, Brazil Field of View: 03 mm Orange Crystal Ushkovite and Brown Spheres Atencioite; Photo and Collection Fernando Brederodes. Mineral

Ushkovite

ushkovite

Formula
MgFe³⁺2(PO4)2(OH)2·8H2O
Mineral

Usovite

usovite

Formula
Ba2CaMgAl2F14
Ussingite, Vuonnemite Locality: Shkatulka pegmatite, Umbozero mine (Umbozerskii mine), Alluaiv Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia Original description: A 3.9 by 2.7 cms mass of lilac Ussingite with some yellowish Vuonnemite. JSS specimen and photo. Mineral

Ussingite

ussingite

Formula
Na2AlSi3O8(OH)
Silver-grey microcrystals of the extremely rare mineral ustarasite from the type locality in Ustarasai deposit, Uzbekistan. Ustarasite is a Pb-Bi sulphosalt. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Ustarasite

ustarasite

Formula
Pb(Bi,Sb)6S10 (?)
Mineral

Usturite

usturite

Formula
Ca3(SbZr)(FeO4)3
Mineral

Utahite

utahite

Formula
MgCu²⁺4Zn2Te⁶⁺3O14(OH)4(H2O)6
Mineral

Uvanite

uvanite

Formula
(UO2)2V⁵⁺6O17·15H2O (?)
Uvarovite Locality: Saranovskii Mine (Saranovskoe), Saranovskaya (Sarany) Village, Gorozavodskii area, Permskaya Oblast', Middle Urals, Urals Region, Russia (Locality at mindat.org) Size: 6.9 x 5.5 x 0.9 cm. This plate of uvarovite garnets from Russia came out of the personal garnet collection of Bill Larson (of Pala Properties). Crystals are invariably small; but, in fact, rather than being just a druse of tiny crystals, the crystals here are actually quite eye-visible and large enough to show flashing faces under good light. Mineral

Uvarovite

uvarovite

Formula
Ca3Cr2(SiO4)3
Uvite Locality: Möng Hsu (Monghsu; Maing Hsu), Shan State, Burma (Myanmar) (Locality at mindat.org) Thumbnail. A complete and terminated crystal of rare chrome" green uvite tourmaline. Chrome is a rare variety of green tourmaline that owes its vivid green hue to trace amounts of chromium and vanadium. This crystal has a nice pyramidal termination and good luster. Mineral

Uvite

uvite
Uytenbogaardtite, from New Bullfrog Mine, Nye County, Nevada, United States of America Mineral

Uytenbogaardtite

uytenbogaardtite

Formula
Ag3AuS2
Orange single crystal of the very rare mineral uzonite from the type locality in Uzon caldera (Uzon Caldera, Kamchatka Krai, Russian Federation). Ex Vandenbroucke Museum collection from Waregem, Belgium Mineral

Uzonite

uzonite

Formula
As4S5
Mineral

Vadlazarenkovite

vadlazarenkovite

Formula
Pd8Bi1.5Te1.25As0.25
Vaesite Field of view: 3 mm Locality: Modena Province, Emilia-Romagna, Italy Octahedral Crystal Vaesite on matrix; Photo and collection Fernando Brederodes. Mineral

Vaesite

vaesite

Formula
NiS2
Outstanding grass green crystals of the extremely rare mineral vajdakite from the type and only known locality worldwide: Jachymov (St Joachimsthal), Bohemia, Czech Republic. Vajdakite is a molybdenum arsenite. Mineral

Vajdakite

vajdakite

Formula
(Mo⁶⁺O2)2As³⁺2O5·3H2O
Mineral

Vakhrushevaite

vakhrushevaite

Formula
Mg5Cr(AlSi3O10)(OH)8
Valentinite Locality: Djebel Nador, Constantine Province, Algeria (Locality at mindat.org) Picture width 5 mm. Collection and photograph Christian Rewitzer Mineral

Valentinite

valentinite

Formula
Sb2O3