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UO₃,3ThO₂,3SiO₂,6H₂O? An altered Mackintoshite (q.v.)? ThO₂ = 41·4; E₂O₃ = 6·7%.

Usually massive; sometimes in crystals resembling Zircon.

G = 4·43-4·54. H = 4-4¹⁄₂. Dull brown; opaque.

Llano Co., Texas.