Locality: La Florida mining area, Herrería-Valdáliga-Rionansa, Comarca Costa Occidental/Saja-Nansa, Cantabria, Spain
Description: I think the one above could be a negative "normal" rhombohedral face. The edge between it and the upper flat rhombohedral face is perpendicular to the maximum slope line (assuming c-axis in vertical position). The two trapezoid faces are my doubt. Maybe of the acute rhombohedron {021}? Maybe of an acute pyramid with high Miller indices? This pair of small trapezoid faces are also present in others vertex of the crystal in the same relative position.

All pictures, text, design © Forum FMF 2006-2024