Fringelite (10cm) crystallized organic pigments
in a fossil crinoid stem (Millericrinus), "sea lily", of upper Jurassic age
See: Geochimica et Cosmochimica 26 (1962), 225; Schweizer Strahler 1 (2013), 2.
Photo and Coll. P. Perroud (now in NHM Geneva)