Tinnunculite (originally described as Unnamed Uric acid dihydrate) as pale pinkish to flesh-coloured, sometimes also white, lancet-like crystals up to ~0.2 mm on matrix; most probably formed from bird dropping. Amidst the crystals lie a few tiny fragments of a brownish chitinous exoskeleton. Find by Josef Metzger, photo Fritz Schreiber; Note that uric acid dihydrate is visually indistinguishable from uricite. Crystals of both are always fragile and either strongly or loosely connected to the matrix; This photo was originally published in: Kolitsch, U. & Raade, G. (2011): Uric acid dihydrate: occurrences in Austria and Norway. Norsk Bergverksmuseum Skrift. 46, 25-29; Locality: Power station, Sportgastein, Naßfeld valley, Gastein valley, Hohe Tauern, Salzburg, Austria; Fov:;
Copyright: Fritz Schreiber