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Legrandite, a new zinc arsenate

Published online by Cambridge University Press:  14 March 2018

Extract

Among a number of specimens which the senior author (J. l)rugman) obtained some years ago from the widow of a mine manager, Mr. Legrand, of Belgian nationality, was one of massive blendc from the Flor de Peña mine, Lampazos, Nuevo Leon, Mexico, which carried a small quantity of a bright yellow, transparent substance that could not be identified with any known mineral. Goniometric and optical examination showed it to be monoclinic, but the material was mainly massive radiating-prismatic, and the few freely developed crystals gave only very approximate measurements (see table II). A chemical analysis by the iunior author showed it to be indeed a new mineral, a basic zinc arsenate, and the name ‘legrandite’ is proposed for it in recognition of the collector. The larger part of what remains after investigation of the small specimen has been presented to the British Museum for preservation in the mineral collection.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1932 

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Footnotes

With X-ray measurements by F. A. Bannister,M. A.

1

Assistant-Keepers in the Mineral Department of the British Museum of Natural History

References

page 175 note 2 Stated by Mr. Legrand to be a ' mine with complex zinc and lead minerals, unfortunately very rich in arsenic, which renders it unworkable '

page 175 note 3 Two determinations were made and gave sp. gr. 3-98 and 4-04.

page 176 note 1 The comparative complexity of the formula as shown by the X-ray data suggests that the simple formulae usually given to some other arsenates and phosphates may require revision.