ULLMANNITE

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Ullmannite is a rare nickel antimony sulphide which occurs quite widely around the world, but very rarely in large, well-formed crystals. This miniature specimen is not from the Ty pe Locality, but is from the same region in Germany - Arnsberg, North Rhine-Westphalia. The Ullmannite forms an aggregate of gun-metal grey cubic crystals upon an aggregate of delicate needle-like Quartz crystals. The Ullmannite crystals reach 4 mm across, but there is some minor abrasion to the largest intergrown crystals. Many of the smaller crystals are well-formed, and cubo-octahedral in form, and there appears to be a single Tetrahedrite microcrystal, as a tarnished grey tetrahedral crystal, and a few tiny Chalcopyrite crystals. It is from the superb systematic collection assembled by the brothers Martin and Michael Günther (1951-2007 & 1956-2021). Show more