Prehnite - Calcite epimorph
Soetwater, South Africa. 22mm x 75mm x 40mm.
One of the best examples of these unique prehnite - calcite epimorphs from Soetwater we have seen, the specimen shows well developed blades as well as the diagnostic contact on the base of the mineral where the calcite would have been.
Soetwater was mined during WWII for optically clear calcite - None of these amazing and unique specimens remain!