A complex scalenohedral crystal of cobaltoan calcite from the Mupine Mine, Kolwezi, Democratic Republic of Congo. This crystal, 5cm long, was one of the best of a batch that came to market at the Munich show in October 1985, when it became part of the famed Jack Halpern collection. It was illustrated in the Mineralogical Record “What’s New in Minerals” column in March/April of 1976 where the group as a whole was described as “a giant improvement on any such calcite previously known”, and it was also figured on the TGMS Show poster when the show had a “Calcite” theme. It remains iconic for its strength of colour, sparkling crystal form and clarity. The beauty of the piece is enhanced by the contrast with the “stem” of green, velvety matrix, described in the Mineralogical Record as malachite, but which may be the cobalt-bearing variant Kolwezite.