“Blackish, lustrous schäferite crystals, rich in crystal faces. The colourless to pale yellow rhombohedra are a mineral of the whitlockite group. This photo was originally published in: Kolitsch, U., Rieck, B., Brandstätter, F., Schreiber, F., Fabritz, K. H., Blaß, G. & Gröbner, J. (2014): Neufunde aus dem alten Bergbau und den Schlacken von Lavrion (II). Mineralien-Welt 25 (2), 82-95 (in German). ”