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A variety of Thorite containing lime—5ThSiO₄,2Ca₂SiO₄ + 10H₂O. ThO₂ = 59·3%.

Completely amorphous.

G = 4·114. H = 4¹⁄₂. Deep red; translucent.

Islands of Läven and Arö, Langesund Fiord, Norway.