Wulfenite, (w. Dolomite after Tennantite)

Chemistry: PbMoO4

Tabular, orange, translucent crystals of wulfenite (to 11 mm), on a matrix comprising mainly curved ivory-white dolomite rhombs and a little quartz.

 What makes this specimen particularly interesting, however, are the epimorphs of grey-brown microcrystalline dolomite after tennantite, that are visible to the right of centre.  The original sulphosalt has been completely dissolved away, leaving only these hollow, idiomorphic dolomite casts.