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Wulfenite


Mineral: Wulfenite
Chemistry: PbMoO4
Size: 40 mm
Owner: Mariusz Oleszczuk
Photographer: Mariusz Oleszczuk

Sharp crystals of wulfenite (to 11 mm), comprising dominant dipyramids, which are finely striated, and truncated by subordinate basal pinacoids.  The larger crystals are a very intense crimson-red in colour - unusual for Tsumeb - although the colour grades to a more common orange-brown at some of the crystal margins, and the smaller crystals on the specimens are orange-brown throughout.

The matrix is massive sulphide, but a green copper secondary mineral is also present (see Photograph 2; FOV is 20 mm). An old label suggests that this is brochantite (?) but this has not been confirmed.