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An accessory mineral in many igneous rocks, particularly those that are felsic, and metamorphosed igneous rocks. It is also found in pegmatites, skarns, and tactites. The cesium rich variety is weakly radioactive. Two edges are terminated. Ex Chris Stefano collection.
Locality: Parham Occurence, Olden Township, Ontario, Canada
Composition: sorosilicate group of minerals within the broader epidote group that contain a significant amount of rare-earth elements