Emerald green Dioptase crystals aesthetically a lighter brown matrix. 

Hollow Mottramite specimen with colorless rhombs of Calcite.  Top view is the end and the smaller photos are the front and back views.  Sits perfectly for the view of the first smaller photo.  

Lustrous colorless flattened rhombs of Calcite.

Quartz was uncommon at Tsumeb.  Here is a fine combination specimen of Quartz and Tennantite.    

Large Tsumeb Calcite.  The top face of the large photo is a cleave but still displays well. 

Teminated Quartz crystals and curved Ankerite crystal. ex Clive Queit.

Several terminated clusters of blue Azurite on matrix.

Acicular crystals of Willemite.

Cluster of large Wulfenite crystals to 4 cm and larger.  Crystals are damaged but are huge.

Clusters of lustrous emerald green Dioptase to 4 mm at each end of this matrix specimen.

Here is a Dolomite cast after Calcite with the Calcite present.  I do not think that the Calcite is original, but redeposited after the original dissolved.