Iridescent bornite in between layers of wollastonite. Ex David Vince. Width of view 3.5mm. Stack of 30 images.
Specimen is 24mm wide. Stack of 20 images. Click on the image below for a higher resolution version.
Single crystal of bornite pseudomorphing pyrite. Width of crystal 15mm. Click on the image below for a higher resolution version.
Bornite pseudomorph after chalcocite, Belmont Mine, Butte, Butte District (Summit Valley District), Silver Bow Co., Montana, USA. Labelled as A Vein, 3000 Level. Ex Hatfield Goudey. Ex John Lewis Collection.