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Zirkelite.

Оглавление

(Ca,Fe)(Zr,Ti,Th)₂O₅, with E, U, Mg, etc. ZrO₂ = 48·9-52·9; ThO₂ = 0-7·3; TiO₂ = 14-15; E₂O₃ = 0-3%.

Cubic; in twinned octahedra.

G = 4·7. H = 5. Black; transparent in thin flakes.

Jacupiranga, São Paulo, Brazil.

The Rare Earths: Their Occurrence, Chemistry, and Technology

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