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BaO,2Na₂O,2(Ti,Zr)O₂,10SiO₂. TiO₂ = 13·2; ZrO₂ = 3·5%.

Monoclinic; wedge-shaped.

G = 3·05. H = 6¹⁄₂. White; transparent.

Narsarsuk, Greenland.