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Minerals

6323 results

Mineral

Oswaldpeetersite

oswaldpeetersite

Formula
(UO2)2(CO3)(OH)2·4H2O
Otavite Locality: Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia (Locality at mindat.org) Picture width 3 mm. Collection and photograph Christian Rewitzer. Microprobed ! Mineral

Otavite

otavite

Formula
CdCO3
White prismatic crystals of the extremely rare germanium mineral otjisumeite, from the only known locality worldwide. Otjisumeite was labeled as RRR in Tsumeb II Gebhard book (Extremely rare, single occurrence with less than 10 specimens known). In fact, when this book was published (1999), only 2 specimens were known worldwide (p.275). Analyzed specimen. Mineral

Otjisumeite

otjisumeite

Formula
PbGe4O9
Mohs
3
Golden brown metallic microcrystals of the extremely rare tin sulphide mineral ottemannite from one of the few known localities worldwide: Forestville, Schuylkill County, Pennsylvania, United States of America. Outstanding and very rich specimen for size the quality. Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Ottemannite

ottemannite

Formula
Sn2S3
Ottensite, Stibnite Locality: Qinglong (Dachang) Sb-Au deposit, Qinglong County, Qianxi'nan Autonomous Prefecture, Guizhou Province, China (Locality at mindat.org) Size: 21.9 x 14.8 x 9.0 cm. A relatively rich and relatively not-so-ugly-as-usual specimen of this new species, from the type and only location known so far. The stibnites measure to about an inch. Much of this material was lost before it was described, because it was "cleaned" off, and so few large specimens remained to be had. From the type locality, from the collection of Marcus Origlieri who helped analyse the new species. He tells me that this is the largest fine specimen showing rich ottensite, good stibnite, and matrix, which he had kept for his own collection. Mineral

Ottensite

ottensite

Formula
Na3(Sb2O3)3(SbS3)·3H2O
Yellow ottohahnite microcrystals associated to a mixture of manganoblödite & cobaltoblödite (confirmed by SEM-EDS) and also associated to bluelizardite and plasilite after the label. From Blue Lizard Mine, Red Canyon, San Juan County, Utah, United States of America. Ex. Erich Laskowski collection (USA). Mineral

Ottohahnite

ottohahnite

Formula
Na6(UO2)2(SO4)5(H2O)7·1.5H2O
Mineral

Ottoite

ottoite

Formula
Pb2TeO5
Ottrélite Locality: Ottré, Vielsalm, Stavelot Massif, Luxembourg Province, Belgium (Locality at mindat.org) This is an exceptional large specimen of a real rarity! Seldom seen in such large pieces, and so richly sprinkled with crystals. 28.3 x 12 x 2.1 cm Mineral

Ottrélite

ottrélite
Grass green crystal aggregates of the rare nickel mineral otwayite from the type locality in Otway Nickel deposit (Otway Nickel Deposit, Nullagine, East Pilbara Shire, Western Australia, Australia). Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. Mineral

Otwayite

otwayite

Formula
Ni2(CO3)(OH)2·H2O
Metallic inclusions of the three very rare Pt-Pd telluride minerals: oulankaite, telargpalite & moncheite, from Lukkulaisvaara Massif (Olanga River, Northern Karelia, Karelia Republic, Russian Federation) in a polished section that was analyzed by the former owner of the specimen: the Vandenbroucke Museum, from Waregem, Belgium. Mineral

Oulankaite

oulankaite

Formula
(Pd,Pt)5(Cu,Fe)4SnTe2S2
Ourayite Locality: Pitiquito, Sonora, Mexico (Locality at mindat.org) A rich thumbnail specimen showing embedded, silvery ourayite (a very rare silver lead bismuth sulfide) on all sides. Ex American Museum of Natural History specimen. 1.9 x 1.7 x 1.7 cm. Mineral

Ourayite

ourayite

Formula
Ag3Pb4Bi5S13
in the center are two pale-yellow tufts of Oursinite, also on the specimen are orange Billietite and other yellow secondary uranium minerals,from Shinkolobwe Mine, Katanga, D.R.Congo FOV: 5mm Mineral

Oursinite

oursinite

Formula
Co(UO2)2(SiO3OH)2·6H2O
Ovamboite, an extremely rare germanium-tungsten sulphide mineral from Tsumeb is known only from this locality worldwide, which is of course the type locality. The mineral is metallic silvery-white and is associated with reddish grey germanite, tennantite and galenite. It is one of the rarities of the deposit and a very sought after species for every Tsumeb specialist. Analyzed specimen. Mineral

Ovamboite

ovamboite

Formula
Cu10Fe3WGe3S16
Mineral

Overite

overite

Formula
CaMgAl(PO4)2(OH)·4H2O
Mineral

Owensite

owensite

Formula
(Ba,Pb)6(Cu,Fe,Ni)25S27
Metallic crystals of the rare silver mineral owyheeite. From: Crown Point, Idaho, United States of America. Mineral

Owyheeite

owyheeite

Formula
Ag3Pb10Sb11S28
Yellow orange microcrystals of the extremely rare ammonium oxalate mineral oxammite, from one of the only four localities known worldwide (Petrogale Cave, Madura Roadhouse, Dundas Shire, Western Australia, Australia) and associated to minoritary aphthitalite. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Oxammite

oxammite

Formula
(NH4)2(C2O4)·H2O
Mohs
2.5
Very big single crystal of the rare mineral Oxo-magnesio-hastingsite (IMA 2011-035, but approved in 2013) from the fourth locality worldwide: Dolánky, Ohníč, Teplice, Ústí Region, Bohemia, Czech Republic. Mineral

Oxo-Magnesio-Hastingsite

oxo-magnesio-hastingsite

Formula
NaCa2(Mg2Fe³⁺3)(Si6Al2)O22O2
Mohs
6
Colour
brown
Mineral

Oxo-Mangani-Leakeite

oxo-mangani-leakeite

Formula
NaNa2(Mn³⁺4Li)Si8O22O2
Mineral

Oxy-Chromium-Dravite

oxy-chromium-dravite

Formula
NaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O
Mohs
7.5
Photomicrograph of dutrowite in plane-polarized light. Symbols after Warr (2021): Ap – “apatite”; Bt – “biotite”; Dtw – dutrowite; Kfs – K-feldspar; Odrv – oxy-dravite; Qz – quartz. “Biotite” is partially altered in “chlorite” and rutile, whereas K-feldspar is sericitized. Red box corresponds to the area where the grain used for single-crystal X-ray diffraction was extracted. Type material. Catalogue number 19890, Museo di Storia Naturale, Università di Pisa. 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

Oxy-Dravite

oxy-dravite

Formula
Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O
Mohs
7
Mineral

Oxy-Foitite

oxy-foitite

Formula
☐(Fe²⁺Al2)Al6(Si6O18)(BO3)3(OH)3O
Mohs
7
Mineral

Oxy-Schorl

oxy-schorl

Formula
Na(Fe²⁺2Al)Al6(Si6O18)(BO3)3(OH)3O
Mohs
7
Nice specimen of oxy-vanadium-dravite from Uzbekistan. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Oxy-Vanadium-Dravite

oxy-vanadium-dravite

Formula
Na(V)3(V4Mg2)Si6O18(BO3)3(OH)3O
Mohs
7.5