The WitkamCOLLECTION

 

Quite an interesting piece. On the outside, there are some shiny crystals of wolframite but the really interesting part is on the inside of vugs in the specimen. There you will find blades of wolframite being 'eaten' by the quartz (Var Chalcedony) and small masses of chalcedony as well. Extremely fascinating to photograph.