Magnetite = Fe3O4 , important IRON - ore mineral.
Crystals grown - OKTAEDER and RHOMBEMDODEKAEDER - on mother rock. Surfaces, highly lustrous. Strongly MAGNETIC.
Place of discovery: Cerro Huanaquino - Potosi - BOLIVIA
Weight: 520 g Dimensions: 13 x 9 x 4 cm
Picture 3 is the back - all around paper flow is only the edge protection, was forgotten to remove in photos.