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ThSiO₄, with H₂O, U, Fe, E, Ca, Al, etc. ThO₂ = 41·4-57·9; E₂O₃ = 0-6%.

Tetragonal; habit prismatic.

G = 4·4-4·8; H = 4¹⁄₂-5. Brown to black.

Various localities in Scandinavia.