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A borosilicate of rare earth metals and barium, with traces of Th, Ca, K, Na, aq. Approximately BaSiO₃, YBO₃. Cer = 4·2; Yttr = 52·5%.

Hexagonal; habit prismatic.

G = 4·407. H = 6-6¹⁄₂. Greenish brown; translucent.

Island of Klein-Arö, Langesund Fiord, Norway.