Another super interesting piece from the DR. GÜNTER GRUNDMANN COLLECTION. In this specific case we have multifaced, tombac-coloured, sharp metallic crystals of Bravoite,- a nickel-bearing variety of Pyrite. Unusual and rare material from the rather ucommon locale Prangenhaus Quarry near Wülfrath. Specimen comes with original label. NOTE: The specimen should be stored in dry environment for stabilization.