Английская Википедия:Caldasite

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Шаблон:Infobox rock

Caldasite (Шаблон:Lang-pt, Шаблон:Lang-de, Шаблон:Lang-es)[1] is a rare uraniferous ore of zirconium found in the Poços de Caldas massif, located in the states of Minas Gerais and São Paulo, Brazil.

It is most often found as a dark gray, very dense, hard rock. It also appears as a friable brown substance.[2]

The massif is an alkaline complex, formed by a large intrusion during the mid-Cretaceous. The ore is a result of hydrothermal alteration of the nepheline-syenitic rocks; it has also been weathered out and concentrated in paleoplacer deposits.

References

Шаблон:Reflist

Further reading

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  2. Шаблон:Cite journal