Ancylite-Ce

This was found in Mont Saint-Hilaire in Québec, Canada, but it’s found around the world at a hundred various localities in igneous pegmatites. Its hardness is 4-4.5 and its specific gravity is 3.95. It gets its name from the Greek αγκυλός (“ankylos”) for “curved”, in allusion to its usually rounded and distorted crystal shapes at the type locality, plus the “-(Ce)” suffix due to cerium being the dominant REE in the composition. There’s not much information available, and it’s not certain whether G. Flink named it in 1899, but its TL is Kujalleq, Greenland, and it’s found in at least 100 various localities worldwide.