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ZrO₂, with small amounts of SiO₂, Fe₂O₃, Al₂O₃, CaO, etc. ZrO₂ = 96·5%.

Monoclinic.

G = 4·4-6·0. H = 6¹⁄₂. Brown; pleochroic.

São Paulo, Brazil; Rakwana, Ceylon.