This polished slab (12 cm) came from the Westenberger collection. The label indicates descloizte, dolomite and smithsonite. My "guess" is that descloizite grew on a breccia fragment (dolomite?) then was infilled with finer layered dolomite?. I have not confirmed dolomite with a hot acid test.

This was followed by radial/concentric growth of smithsonite. The outer orange rind is totally crystal points about a mm in size. The second photo is under a Convoy LW UV light. The smithsonite shows bright yellow. I suspect the blue-white fluoresent spots on the breccia fragment may be hydrozincite, although this is not listed at Berg Aukas. The material cosists of a fine white coating in open spaces to a few mm. Would like comments about genesis.