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A silicate of Zr, ZrSiO₄, with E, Th, U, Cb, etc. ZrO₂ = 55·2; Yttr = 9·12; ThO₂ = 5·01%.

Tetragonal; in globular aggregates.

Gr = 4·091. H = 7¹⁄₂. Dark green or brown; dull.

Gravel-tin of Japan.