Håleniusite-(La)

Håleniusite-(La) (La,Ce)OF is a yellow isometric mineral named in honor of Prof. Ulf Hålenius, director of the mineralogy department at the Swedish Museum of Natural History in Stockholm, Sweden. It was descovered in 1986 and has a dull, earthy lustre. The geological setting of Håleniusite-(La) is in vugs and leaching zones of massive Ferriallanite-(Ce), intimately intergrown with Cerite-(Ce) and Bastnäsite-(La). It was descovered at Bastnäs mines, Riddarhyttan, Skinnskatteberg, Västmanland, Sweden.