“Blue roedderite crystals in a haüyne like form from a find in the 1980´s. Photographed about 1989 from the collection of Alice and Eugen Rondorf as a pair of slides and converted to a digital crossed eyestereo picture. For today standards the picture is blurred an lacks of depth of field, as stacking was not possible in this time., but it well shows the benefits of stereo view pictures. Betz, V. (1990) High Magnification Mineral Stereomacrography. Mineralogical Record, 21, 475-480”