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3CaSiO3,Ca(F,OH)NaZrO₃. ZrO₂ = 21·5; TiO₂ = 1·5%.

Anorthic; habit tabular.

G = 3·27; H = 5-5¹⁄₂. Yellow, with weak pleochroism.

Island of Läven, Langesund Fiord, Norway.