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Florencite, a new hydrated Phosphate of Aluminium and the Cerium Earths, from Brazil

Published online by Cambridge University Press:  14 March 2018

E. Hussak  and
G. T. Prior
E. Hussak
Affiliation:
Geological Survey of S. Paulo
G. T. Prior
Affiliation:
Mineral Department of the British Museum
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Extract

Florencite was first discovered as a rare constituent of the cinnabar-bearing sands of Tripuhy, near Ouro Preto, Minas Geraes, Brazil. Here it occurred in well-developed crystals (up to ½ cm. in, length), in association with monazite, xenotime and the titano-anti. monates (lewisite and derbylite) previously described. Blowpipe experiments made hy Dr. W. Florence showed that the mineral was a phosphate of the cerium earths, while angular measurements of the crystals and observations of the optical characters suggested its close relationship with hamlinite, the new hydrated phosphate of aluminium, barium and strontium, recently described by Hidden and Penfield.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 12 , Issue 57 , July 1900 , pp. 244 - 248
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1900

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References

page 244 note 1 Min. Mag. XI, 80, 176 (1896-7).

page 244 note 2 Am. J. Sci. 1890, XXXIX, 511, and 1897, IV, 313.

page 246 note 1 An attempt to determine the water directly by igniting the mineral in a porcelain boat in a combustion tube failed owing to the fact that in this way it could not be heated to a sufficiently high temperature.

page 246 note 2 Two determinations of the molecular weight were made, one on 0.0743 gr. and the other on 0.1113 gr. of the ignited oxide, by converting into sulphate and precipitating the sulphurie acid with barium chloride. The two results were in close agreement (352.2 and 352.7), but give a number which is considerably higher thau those usually accepted for any of the cerium earths. Examination of the absorption spectrum of a solution of the sulphate suggested that didymium was only present in very small amount, as the characteristic bauds in the green and yellow were only faintly visible.

page 247 note 1 Am. J. Sci. 1897, IV. 314.

page 248 note 1 Wyrouboff, Bull. Soc. Min. 1896, XIX,.282; Cossa, Compt. Rend. XCVIII, 1884, 990; Accad. d. Lincei, 1878 and 1879 [3] and 1886 [4].

A correction has been issued for this article:

Errata