On the occurrence of monazite as an accessory element in rocks

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Abstract
ART. XII.-On the oooU'rr'enoe Qf 1I'Ionazite as an aOoess01.'yElement in Rooks j by ()RVILLE A. DERBY.SOME five or six years ago Mr. John Gordon, an American mining engineer now engaged in commerce in Rio de Janeiro, brought to my attention a peculiar heavy yellow sand which had been sent to him from the province of Bahia under the supposition that it was tin sand.This on examination proved to be monazite with the composition, according to an analysis by Prof. Henri GOl'ceix of the Ouro Preto Mining School (Oomptes Rendus, 1885): Phosphoric acid 28'7 per cent, oxide of cerium 31'3 per cent, oxides of didymium and lanthanum (1) 39•9 = 99'9.Inquiries instituted by Mr.Gordon and myself in regard to the locality and mode of occurrence of this sand revealed the fact that it occurs in considerable patches on the sea beach near the little town of Alcoba~a in the southern part of the province of Bahia, where it seems to have been accumulated by natural concentration through wave action.Attention having been thus drawn to this mineral, Prof. Gorceix has since detected yellow grains in the diamond sands of several localities of the provinces of Minas Geraes and Bahia which from giving the didymium lines in the hand spectroscope have been referred to monazite, and I have• myself identified it by the same process in gold sands from several points in the provinces of Minas, Rio de Janeiro and Sao Paulo.The wide distribution of the mineral in the sea and river-sands of Brazil was thus established, but under circumstances that gave no clue to its origin.Recently Mr Gordon informed me that in examining with a lens the sands of the beaches about Rio de Janeiro he found .alwaysyellow grains similar in appearance to the Bahia monazite and that on 'concentrating the sands in a copper miner's pan, he obtained a small quantity of white and yellow sand that
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Authors Orville A. Derby
Journal american journal of science
Year 1889
DOI
10.2475/ajs.s3-37.218.109
URL
https://ajsonline.org/article/62741.pdf
Keywords Keywords not found

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