TMA96AP5: Trapezohedral Chalcopyrite crystals, very sharp, with metallic iridescence dominated by blue, on a matrix of Siderite.
The specimen, a German classic, comes from the Robert-Auguste Touchon collection.
Friedrich-Wilhelm Mine, Biersdorf, Daaden, Daaden-Herdorf, Altenkirchen District, Rhineland-Palatinate/Rheinland-Pfalz  Germany

Specimen size: 6.1 × 4 × 3.8 cm = 2.40” × 1.57” × 1.50”

Main crystal size: 1.2 × 0.6 cm = 0.47” × 0.24”