Description
A very fine, doubly terminated, jet-black crystal of Columbite, very probably Columbite-(Fe), up to 4,5 cm on Columbite-matrix from Araçuaí of Minas Gerais, Brazil. The luster is very good along the prism faces and there are multiple facetes at one side of the terminations, the other one is flat. This specimen has to be considered to be one of the finest of the locale due to the circumstance of size and integrity.