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Cafarsite, named after the presence of calcium, iron and arsenic within its chemistry, was first described in the 1960s from Wanni Glacier (Wannigletscher) near Monte Cervandone on the Swiss/Italian border and has only been reported from a handful of localities, nearly all of which are in the European alps. This miniature specimen from the superb systematic collection assembled by brothers Martin and Michael Günther (1951-2007 & 1956-2021) is from Mt. Cervandone on the Italian side of the border. It features many well-formed dark brown octahedral to cubo-octahedral Cafarsite crystals on matrix. The two main crystals are 4.5 and 4 mm across but there are many others sub-1 mm in size. A fine example of this alpine rarity.
55 x 37 x 44 mm