Читать книгу The Rare Earths: Their Occurrence, Chemistry, and Technology - Stanley Isaac Levy - Страница 74

Silico-titanate of E, Al, Mg, Ca, Na, etc., with F and aq. Cer = 13·5; Yttr = 1·1; TiO₂ = 7-8; ThO₂ + ZrO₂ = 3·6%.

Monoclinic, very close to Epidote.

G = 3·19-3·29. H = 5. Brownish green; weakly pleochroic.

Islands of the Langesund Fiord, Norway.