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Titano-silicate of E, Th, Fe, Ca, etc. Cer = 23-47; Yttr = 0-3·4; ThO₂ + ZrO₂ = 0-20; TiO₂ = 16-21%.

Massive, amorphous.

G = 4·26-4·55. H = 5-5¹⁄₂. Velvet black.

Ilmen Mountains; Nelson Co. and Bedford Co., Virginia, U.S.A.