Bournonite (“cogwheel”) George Robertson It’s incomplete on the back

It’s incomplete on the back where it came off the matrix

large Pyrite pseudomorph after compressed rhombohedra of Siderite which is associated with sharp

No damage and really attractive

but the combination of yellow and golden-brown together is bizarre to be sure

“Minerals of Colorado” – 1997 mentions Ferrimolybdite as occurring from Climax but also states that Ferrimolybdite was formerly referred to as Molybdite and implies that Molybdite is not a valid mineral(

Bournonite (“cogwheel”) George Robertson It’s incomplete on the backI have to say up front that this piece simply is better than the photos indicate. The HIGH luster of the faces made it difficult to photograph. The specimen is in great shape overall, and the robust crystals with their sharp, well defined surfaces are very hard to find from this mine. The piece is twinned and shows the classic "cogwheel" shape that was made famous by the classic specimens from Cornwall, England. Great quality on the display side, and