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Minerals

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White crystal aggregates of the extremely rare Na-Li phosphate mineral olympite from the type locality in Khibiny massif in Russia (Rasvumchorr Mountain, Khibiny Massif, Murmansk Oblast, Russian Federation). Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Olympite

olympite

Formula
LiNa5(PO4)2
Mohs
4
Mineral

Omariniite

omariniite

Formula
Cu8Fe2ZnGe2S12
Mineral

Omeiite

omeiite

Formula
(Os,Ru)As2
Mohs
7
Mineral

Ominelite

ominelite

Formula
(Fe²⁺,Mg)(Al,Fe³⁺)3(SiO4)(BO3)O2
Mineral

Omongwaite

omongwaite

Formula
Na2Ca5(SO4)6·3H2O
I am the author of this picture. Picture of pieces of eclogite (type of rock) from the Western Gneiss Region in Norway. The rock contains the minerals omphacite (green), pyrope-garnet (red), quartz (milky), kyanite (blue) and some phengite (golden white). Mineral

Omphacite

omphacite

Formula
(Ca,Na)(Mg,Fe,Al)Si2O6
Yellow microcrystals of the extremely rare mineral omsite (IMA 2012-025) associated to minoritary ullmanite from the type and only one of two known localities worldwide: Correc d'en Llinassos, Oms, Pyrénées-Orientales, Occitanie, France. Mineral

Omsite

omsite

Formula
Ni2Fe³⁺(OH)6[Sb(OH)6]
Light green ondrušite crystals with some blue lavendulan. Field of view 5 mm. From: Svornost Mine, Jáchymov, Jáchymov District, Krušné Hory Mts, Karlovy Vary Region, Bohemia, Czech Republic. Mineral

Ondrušite

ondrušite

Formula
CaCu4(AsO4)2(AsO3OH)2·10H2O
Mineral

Oneillite

oneillite

Formula
Na15Ca3Mn3Fe²⁺3Zr3Nb(Si25O73)(O,OH,H2O)3(OH,Cl)2
:Spray of thin, tabular crystals of onoratoite. At the bottom left a clear and well-formed crystal of gypsum. This is an old specimen, already represented in the book "Come collezionare i minerali dalla A alla Z", Alberto Peruzzo Editore, 1988, page 221. Ex A. & R. Pagano collection. Now in the collection of Gianfranco Ciccolini, author of the photo here posted. Locality: Le Cetine di Cotorniano Mine, Chiusdino, Siena Province, Tuscany, Italy Mineral

Onoratoite

onoratoite

Formula
Sb8Cl2O11
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

Oosterboschite

oosterboschite

Formula
(Pd,Cu)7Se5
Mineral

Ootannite

ootannite

Formula
Th⁴⁺2W⁶⁺4O16·5H2O
Opal banded Mineral

Opal

opal

Formula
SiO2·nH2O
Mineral

Ophirite

ophirite

Formula
Ca2Mg4[Zn2Mn³⁺2(H2O)2(Fe³⁺W9O34)2]·46H2O
Mineral

Oppenheimerite

oppenheimerite

Formula
Na2(UO2)(SO4)2·3H2O
Metallic inclusions of the extremely rare mineral orcelite in pentlandite and maucherite in an analyzed specimen by SEM/EDS by the former owner of the specimen. From: Nipissing District, Ontario, Canada. The specimen is partially polished due to the analysis. Ex Vandenbroucke Museum collection from Waregem, Belgium. Mineral

Orcelite

orcelite

Formula
Ni5-xAs2, x ~ 0.25
Ordoñezite Field of view: 3 mm Locality: Genna zinc smelter, Letmathe, Iserlohn, Märkischer Kreis, Arnsberg, North Rhine-Westphalia, Germany (locality at mindat.org) Mineral

Ordoñezite

ordoñezite

Formula
ZnSb⁵⁺2O6
Oregonite, Awaruite Locality: Josephine Creek placers, Josephine Creek District, Josephine Co., Oregon, USA Dimensions: 11 mm x 4 mm x 5 mm A nugget of oregonite with "josephinite" (= awaruite), from Excalibur Mineral Company. Collection and photo Erik Vercammen. Mineral

Oregonite

oregonite

Formula
Ni2FeAs2
Mohs
5
Images of sample 1174C. (a) BSE image and transmitted-light photomicrograph showing colour, and distribution of highest-Cr parts (light areas in BSE). Note ball of chromium (Cr0) on edge of crystal. (b) 3D oblique view and compositional map of the surface of 1174C before sectioning. Rough dark green in lower part of the image is the ruby; smooth dark green in the upper part is kahlenbergite (KAl11O17). Small bright grains along rim of crystal in middle of image are Ni-bearing iron. Bright pink-purple “mushrooms” are chromium. (c) Phase map and Al map of the contact between the largest Cr ball, showing higher Cr (lower Al) toward the Cr ball, and the compositional granularity of the high-Cr zone. (d) TEM-BSE image and element maps of FIB foil across contact between chromium and Cr-rich corundum, separated by a zone of oreillyite (scale bar indicates 2 μm). Note granularity in the Cr and Al maps of the corundum, interpreted as the result of spinodal breakdown. The image is published in an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Mineral

Oreillyite

oreillyite

Formula
Cr2N
Mineral

Organovaite-Mn

organovaite-Mn

Formula
K2MnNb4(Si4O12)2O4·5-7H2O
Organovaite-Zn Locality: Karnasurt Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia Pink/pinkish brown massive Organovaite-Zn. Field of view 6 mm. Depth of field is achieved with CombineZM. Specimen and photo Leon Hupperichs. Mineral

Organovaite-Zn

organovaite-Zn

Formula
K2Zn(Nb,Ti)4(Si4O12)2(O,OH)4·6H2O
Mineral

Orickite

orickite

Formula
2CuFeS2 * H2O
Orientite Locality: Manganese Mine, Copper Harbor, Keweenaw County, Michigan, USA Original description: Collected 2011 by D. Maietta. Field of view is 0.68mm Lens: Nikon M Plan 20 F-stop: N/A Mounting: Normal, extension = 210 mm FOV: 0.68 mm Lighting: Dual fiber partially diffused Processing: CombineZP do-stack Mineral

Orientite

orientite

Formula
Ca8Mn³⁺10(SiO4)3(Si3O10)3(OH)10·4H2O
Mineral

Orishchinite

orishchinite

Formula
Ni2P