Minerals O

Ogdensburgite xx

340 Level, Sterling Mine, Sterling Hill, Ogdensburg, Sussex Co., New Jersey / USA / TYP; orange-brownish botryoidal coating of tabular microcrystals, on vugs in Willemite-Franklinite matrix; KS 65,00

Okhotskite xls

Agnew Meadow Mine, Olaine Lake, Madera Co., California / USA; brown glassy crystal aggregates of 5 mm, together with black Magnetite in pale pinkish Rhodonite matrix; KS 48,00

Oldhamite (xls)

Lichtenberg-Absetzhalde, Ronneburg, Gera, Thuringia / Germany; this rare Calcium Sulfide is usually known only from meteorites, but occurs here as dark grey microcrystalline aggregates of 2 cm in pale brownish matrix; KS 38,00; NS 85,00

Olenite xl

Usakos, Karibib District, Erongo Region / Namibia; lustrous deep-blue transparent gemmy single crystals of 2 cm (KS) to 3 cm (NS). These are the finest crystals of this rare mineral of the Tourmaline group I have ever seen. Only a few crystals available, collected in the 1950s; KS 125,00; NS 225,00

Oligoclase xl

Uluguru Mts., Morogoro Region / Tanzania; nice colorless well terminated crystals of 3 cm with a very bright orange red iridescence like inclusions of confetti; KS 19,00

Olsacherite xls

Mina El Dragon, Antonio Quijarro Prov., Potosí Dept. / Bolivia; white fuzzy to needle 0,5 mm crystals, inter grown to aggregates of 1 mm, together with blue Chalcomenite crystals on vugs in Krutaite-Penrosite matrix. Nice specimens of the rare Lead-Selenites; MM 38,00

Olsacherite xx

Mina El Dragón, Antonio Quijarro Prov., Potosí Dept. / Bolivia; white fuzzy to needly 0.5 mm crystals, intergrown to aggregates of 1 mm, together with blue Chalcomenite crystals on vugs in Krutaite-Penrosite matrix. Nice specimens of this rare Lead-Selenite; MM 48,00

Olshanskyite xx

Shijangshan, Jinpeng, Chifeng, Inner Mongolia / China; colorless to white long prismatic well terminated crystals of 2 cm, inter grown to nice crystal clusters with some Calcite Sphalerite matrix. This new find are the finest known specimens of the rare Ca-Borate. See article in "Lapis" issue July/August 2014; KS 85,00; NS 165,00

Omphacite xls

Aheim, Almklovdalen, Vanylven, More og Romsdal / Norway; dark-green prismatic crystals of 2 mm, very rich as surrounding crystal aggregates of cores of 1 cm large Pyrope crystals. Very unusual specimens; KS 28,00; NS 48,00

Omphacite xx

Kefalos Hill, Skotini Bay, Galissas, Syros Island, Aegean Sea / Greece; long-prismatic dark green crystals to 1,5 cm together with green tabular Clinochlore crystals on a matrix of dark blue Ferroglaucophane crystals; NS 65,00

Omsite xx
IMA 2012-025

Correc d'en Llinassos, Oms, Céret, Pyrénées-Orientales, Languedoc-Roussillon / France / TYP; minute yellowish crystals of approx. 0,1 mm in vugs in Siderite matrix; MM 85,00

Onoratoite xx

Le Cetine di Cotorniano Mine, Chiusdino, Siena Prov., Tuscany / Italy / TYP; white high lustrous needle crystals crystal aggregates of 3 mm, with pale brown Stibiconite, colorless Cervantite, yellow Sulfur on Quartz crystals on vugs in silicified dolomitic limestone;
KS 38,00

Opal-AN

Zinster Kuppe, Steinwitzhügel, Kemnath, Fichtelgebirge, Bavaria / Germany; colorless glassy botryoidalic aggregates of several centimeter on Basalt matrix. This are the finest German Opale-AN specimens I have seen ever; NS 38,00-75,00

Orcelite (xls)

Heimberg Quarry, Wolfshagen, Harz, Lower Saxony / Germany; thisr are Nickel-Arsenide forms small bronze metallic crystal aggregates together with 3 mm Gersdorffite crystals and some times a few Millerite crystals in massive Gersdorffite matrix; KS 38,00

Orpiment xx

Usoriyama Lake, Osorezan, Aomori Prefecture, Honshu Island / Japan; yellowish-grey crystals of 3 mm intergrown to ball-like aggregates of 1.5 cm. Developed in fumaroles in lake sediments; MM 28,00

Orpiment xx

Crven Dol Mine, Allchar, Majdan, Kavadarci, Roszdan / Macedonia; very attractive crystal clusters of bright yellow bladed 5 mm Orpiment crystals. Allchar has produced the finest known European Orpiment specimens; NS 28,00; HS 65,00

Orpiment xx

Moldova Noua Sasca, Banat Mts., Caraş-Severin Co., / Romania; yellow bright lustrous crystals of 1 cm inter grown with some Relgar to massive crystal aggregates. Old historic specimens collect all round 1880. The place is already mined since the Roman times; NS 38,00

Orthoclase xx
"Carlsbad twins"

Petschau, Karlsbad, Bohenia / Czech Republic / TYP; beige Carlsbad-twinned orthoclase crystals of 2,5 cm (KS) to 5 cm (NS) from the type-location of the "Carlsbad twins"; KS 19,00; NS 38,00

Orthoserpierit xx

Lange Wand, Ilfeld, Harz, Thüringen / Deutschland; hellblau feinnadelige Kristallkrusten sehr reich auf Sandstein. Es dürften mit Abstand die besten Deutschen Orthoserpierit Stufen sein; KS 28,00; NS 38,00

Osmium X

Neiva River, Newjansk, Ekaterinburg, Ural Mts. / Russia; grey- metallic hexagonal tabular single crystals of 3 mm (Cap) up to
6 mm !! (MM) These are some of the world biggest known Osmium crystals; Capsel 38,00; MM 750,00

Osmium X

Neiva River, Newjansk, Ekaterinburg, Ural Mts. / Russia; grey metallic hexagonal tabular single crystals of 3 mm (Cap) up to
5 mm !! (MM) There are one of the world biggest known Osmium crystals; Capsel 38,00; MM 480,00

Otwayite xls

Otway Ni Deposit, Nullagine, East Pilbara Shire, Western Australia / Australia / TYP; this rare Nickel-Carbonate occurs as glassy bright radial acicular crystal aggregates of 5 mm, on fracture zones in green Pecoraite matrix.Nice specimens;
MM 38,00; KS 65,00

Ovamboite (xx)

Tsumeb Mine, Tsumeb, Otavi Mts., Otjikoto Region / Namibia / TYP; inclusions of 100 µm very rich in Germanite, together with some Renierite, Sphalerite and Galena. Very good specimens of this very rare Sulfide; MM 48,00; KS 220,00

Owyheeite (xx)

St. Andreasberg, Harz Mts., Lower Saxony / Germany; pale grey-metallic acicular crystal aggregates, very rich in Quartz matrix, together with some Galena and Sphalerite. Old samples, newly examined. Collected around 1900. Owyheeite has never been found before in St. Andreasberg. Only a few specimens available; MM 65,00; KS 148,00

Oxiberaunite xx

Rotläufchen Mine, Waldgirmes, Wetzlar, Hesse / Germany; dark orange-red-brown long-prismatic crystals and acicular crystal groups to 7 mm, very richly scattered on iron ore matrix. Very nice and historic specimens from the active time of mining (before 1905); KS 38,00; NS 95,00

Oxo-magnesio-hastingsite xls

Radersberg, Brück-Dreis, Daun, Eifel Mts., Rhineland-Palatinate / Germany; deep-dark brownish well terminated single crystals of 2 cm on brownish Lava matrix. Quite large crystals for this new mineral of the Amphibole group; NS 75,00

Oxycalciobetafite (xx)

Tangen Feldspar Mine, Kragero, Telemark / Norway; lustrous dark orange-brownish crystals of 3 mm, together with some brownish Hingganite-Y and a few white crystals of Lokkaite-Y grown in Feldspar matrix. Rich specimens of this extremely rare Calcium-Titanium-dominant member of the Pyrochlore group; KS 95,00

Oxycalciomicrolite xx

Ipe Mine, Governador Valadares, Doce Valley, Minas Gerais / Brazil; orange-brown high lusterous transparent crystals of 2 mm, very rich on massive Oxycalciomicrolite matrix; MM 28,00; KS 48,00

Oxycalcioromeite xx

Harstigen Mine, Persberg, Filipstad, Värmland / Sweden; glassy orange-brownish crystals of 0,5 mm in Piemontite-Hematite matrix; MM 75,00

Oxyphlogopit xx
IMA 2009-069

Rothenberg Quarry, Bell, Mendig, Eifel, Rheinland-Pfalz, Deutschland / TYP; orange-braune hochglänzende tafelige um 1 mm große Kristalle, vereinzelt in Alkali-Basalt Matrix; KS 38,00

Oxyphlogopite xx

South Zirkel Mesa, Leucite Hills, Sweetwater Co., Wyoming / USA; pale reddish-brown 2 mm tabular crystals, very rich with colorless 1 mm needle crystals of a Titanium-rich Potassicrichterite and Leucite in Lamproite lava. South Zirkel Mesa is the third-known location for this rare Mica mineral; KS 38,00; NS 65,00

Oyelite xx

Fuka Mine, Bitchu-cho, Takahashi, Okayama, Honshu Island / Japan / TYP; white aggregates of intergrown 1 mm crystals on Calcite matrix; MM 28,00; KS 48,00

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Abbreviations:

xx = crystals
(xx)= partial or intergrown crystals
X or x = single crystal
Capsel (capsule) = 0.1 to 0.5 cm
MM = micromount approx. 0.5 to 1.0 cm
KS = small piece approx. 1.5 to 4 cm;
NS = average-sized piece approx. 4 to 7 cm
HS = hand-sized piece 7 to 10 cm;
GS / MS = museum-sized pieces larger than 10 cm

Abbreviations:

xls = crystals; (xls) = partial or intergrown crystals; xl = single crystal.

Capsule= 0.1 to 0.5 cm; MM = micromounts approx. 0.5 to 1.5 cm; KS = small piece approx. 1.5 to 4 cm.

NS = average-sized piece approx. 4 to 7 cm; HS = hand-sized piece 7 to 10 cm; GS / MS = museum-sized pieces larger than 10 cm.