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Uraninite.

Оглавление

Oxides of U (60-75%), with PbO₂, ThO₂, ZrO₂, E₂O₃, Fe₂O₃, etc. Cer. = 0-2·7; Yttr = 0-10·2; ThO₂ = 1·6-11·1; ZrO₂ = 0-8·1%.

Cubic, usually massive; alters to amorphous pitchblende.

G = → 6·4 (massive); → 9·7 (crystalline). H = 512. Black; transparent in splinters.

Norway; Bohemia; Saxony; Cornwall; Carolina, etc.

The Rare Earths: Their Occurrence, Chemistry, and Technology

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