Watch a video of this specimen by following the Vimeo link below: https://vimeo.com/1168565980/c006bc0d3f Here is a superb specimen from Le Rivet quarry in Peyrebrune featuring zoned white calcite crystals and iridescent pyrite on bladed siderite. The matrix consists in jet black sphalerite. A cool combination from Peyrebrune. Notice the back side is also nicely crystallized with calcite and you can also see a piece of host rock. A splendid Peyrebrune combination specimen in absolutely pristine condition: very hard to come by! Ex coll. Bac. Jean-Pierre Bac was a highly active regional field prospector in the departments of Cantal, Aveyron, and Lot from the 1970s through the 2010s. He became a specialist of Curebourse and Enguialès, having developed a close relationship with the family who owned the latter mine. Several specimens from his Curebourse collection were illustrated and published in Le Règne Minéral (1999, issue 29). He also made several remarkable and unusual discoveries in a quarry near Miécaze. Another part of his collection consisted of carefully selected international specimens acquired from French mineral dealers during that period.