COLTAN



The chemical composition of this mineral group is very variable. The actual 


columbite tantalite family consists of the columbite mixed crystal series (with the 


end members columbite (Fe) and columbite (Mn)) as well as from the tantalite 


solid solution series (with the end members tantalite (Fe) and tantalite (Mn) ). 


Between all four end members there is the possibility of solid solution formation, 


which however is not complete in certain areas. Occasionally, the antimony-rich 


minerals Stibiotantalit and Stibiocolumbit are counted. Primarily attached to 


crystalline rocks, inter alia at alkaline pegmatite passages, these minerals are 


often found on secondary deposits, such as heavy mineral soaps.

 

 

 

 

 
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