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An isomorphous mixture of Titanite (q.v.) with (E,Al,Fe)SiO₅. E₂O₃ = 5-12; TiO₂ = 26-30%.

Monoclinic; isomorphous with Titanite.

G = 3·52-3·77. H = 6¹⁄₂. Brown to black.

Various localities in Norway.