page_title: Trogtalite
hierarchical_section_title: Trogtalite
caption_attribution_description: English: 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. Deutsch: Oosterboschit, Trogtalit, Cuprosklodowskit, Quarz Fundort: Musonoi Mine, Kolwezi, Kolwezi Distrikt, Katanga Kupfersichel, Katanga (Shaba), Demokratische Republik Kongo (Zaire) Größe: 4,2 x 2,9 x 2,3 cm Oosterboschit und Trogtalit sind sehr seltene Selenide, wobei ersteres Palladium und Kupfer und letzteres Cobalt enthält. Die berühmte Lagerstätte Musonoi ist die Typlokalität für Oosterboschit. Dieses Stück stammt aus der Sammlung von Howard Belsky, der viele seltene Arten sammelte. Wir glauben, dass die grauen, von einem grünen Mineral umgebenen Kristalle an einem Ende aus Oosterboschit bestehen. Die Quarz-Matrix enthält grüne Cuprosklowdoskit-Nadeln als Drusenfüllung. Eine weitere Drusenfüllung mit braunen Kristalle könnte aus oxidiertem Trogtalit bestehen. Bei Mindat wird diese Spezies als rosa-violett beschrieben. Im Normalfall wäre eine Röntgenstrukturanalyse nötig, um die Mineralarten dieser Probe zu bestätigen. Da diese jedoch aus der Belsky Sammlung stammt, sind die Angaben zur Probe vertrauenswürdig. Belsky hatte seine eigene analytische Einrichtung und arbeitete zudem viel mit Freunden in Museen zusammen, die auf Raritäten spezialisiert waren.
context_page_description: Trogtalite is a rare selenide mineral with the formula CoSe2. It crystallizes in the cubic system and is part of the pyrite group, consisting of Co²⁺ and Se₂²⁻ ions. It has a rose-violet colour and its crystals are opaque. It often occurs as grains. It was thought to be dimorphous with hastite, but this was discredited in 2009. Hastite turned out to be the iron selenide mineral ferroselite. It forms a solid solution series with krut'aite.
context_section_description: Trogtalite is a rare selenide mineral with the formula CoSe2. It crystallizes in the cubic system and is part of the pyrite group, consisting of Co²⁺ and Se₂²⁻ ions. It has a rose-violet colour and its crystals are opaque. It often occurs as grains. It was thought to be dimorphous with hastite, but this was discredited in 2009. Hastite turned out to be the iron selenide mineral ferroselite. It forms a solid solution series with krut'aite.
caption: Piece of oosterboschite with cuprosklodowskite, quartz, and brown oxidized trogtalite from the Musonoi mine. From the Howard Belsky collection.
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