Exceptional and very rare green octahedron Fluorite on ...
Description: Exceptional and very rare green octahedron Fluorite on smoky Quartz from Les Courtes, Massif du Mont-Blanc (1992). From J-F Charlet, R. Ghilini and D. Lagarde, Musée Alpin coll. Crystal size: 3,5 x 3,5 cm. Photo: J. Rosell.