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Retzian.

Оглавление

Hydrated arsenate of Mn´´, Ca, E. Cer + Yttr = 8-11%.

Orthorhombic, usually in prisms.

G = 4·15. H = 4. Brown; pleochroic; transparent.

Province of Nordmarken, Sweden.

The Rare Earths: Their Occurrence, Chemistry, and Technology

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