Bournonite (“cogwheel”) George Robertson “Minerals of Colorado” – 1997

“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(

This piece really does have it all

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

Specimen # BROOK31904

Bournonite (“cogwheel”) George Robertson “Minerals of Colorado” – 1997I 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