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On paratacamite and some related copper chlorides1

Published online by Cambridge University Press:  14 March 2018

Clifford Frondel
Clifford Frondel*
Affiliation:
Harvard University, Cambridge, Massachusetts
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Extract

In the course of a study of the corrosion products formed by seawater sprayed at a temperature of 85° F. on brass and copper sheets, a pale green compound was isolated which proved on chemical analysis to have the composition Cu2(OH)3Cl. The X-ray powder diffraction pattern of the substance was found on visual comparison to differ from that of atacamite, which has the same chemical composition. The atacamite pattern was obtained from a specimen of the mineral from Moonta, on the u peninsula, South Australia, that had been authenticated by both morphological measurement and optical study; identical patterns were obtained from a number of other specimens labelled atacamite. The pattern of the corrosion product proved to be identical, however, with that of two specimens in the Harvard collection labelled paratacamite. These were labelled as from Remolinos, Vallinar, Chile (no. 97523), and from Sierra Gorda, Chile (no. 82883).

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 208 , March 1950 , pp. 34 - 45
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1950

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Footnotes

1

Contribution from the Department of Mineralogy and Petrography, Harvard University, No. 308.

References

1. Contribution from the Department of Mineralogy and Petrography, Harvard University, No. 308.

2. Smith, G. F. H., Paratacamite, a new oxychloride of copper. Min. Mag., 1906, vol. 14, pp. 170-177 CrossRefGoogle Scholar.

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1. Paratacamite. Generosa mine, Sierra Gorda, Chile. Analyst, G. T. Prior (Smith, 1906).

2. Paratacamite. Remolinos, Chile. Analyst, L. C. Peck, 1948. Analysis recalculated to 100 after deducting 0.97 % insoluble.

3. Cu2(OH)3Cl. Theoretical composition of paratacamite and atacamite.

4. The non-identity of paratacamite and atacamite was established independently by X-ray study by F. A. Bannister in an unpublished study made while this work was in progress.

5. In fig. 1 of Smith's paper, showing a twin on (1011), the form letters a and e should be transposed.

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