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Zapatalite, a new mineral from Sonora, Mexico

Published online by Cambridge University Press:  05 July 2018

Sidney A. Williams
Sidney A. Williams*
Affiliation:
British Museum (Natural History), London, S.W. 7, England1
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Summary

Zapatalite, Cu3Al4(PO4)3(OH)9·4H2O, was first found at a small prospect north-west of Cerro Morita, 27 kilometers south-west of Agua Prieta, Sonora. It occurs in silicified and brecciated limestone with libethenite, chenevixite, beaverite, alunite, and pseudomalachite.

Zapatalite is pale (faience) blue with pale blue streak; H = 1½, G = 3·016±0·026. It is soluble in cold dilute acids and decomposed by 20% KOH. Duplicate analyses on samples of about 9 and 15 mg gave CuO 27·92, 25·77%; Al2O3 20·16, 20·26%; P2O5 20·69, 22·51%; H2O 15·46, 15·79%; insol. (baryte and quartz), 15·46, 15·79%. This leads to the formula Cu3Al4(PO4)3(OH)9·4H2O.

The cell can be indexed as tetragonal with a 15·22Å, c 11·52Å, and a volume of 2669Å3. If Z = 6, empirical cell contents are Cu19·4Al22·8(PO4)17·6(OH)55·422·2H2O, and the calculated G = 3·017. Strongest lines of the powder pattern are 7·62 (10), 11·60 (10), 5·75 (7), 6·82 (7), 3·04 (5), 2·53 (5), 2·95 (4), and 2·88 (4).

Pale green in thin section with feeble dichroism in green, with ε > ω. The good basal cleavage is a length slow direction. Indices for Na-D are ε = 1·635, ω = 1·646. Usually uniaxial (—), but may be biaxial (—) with variable 2 V.

Named for Emiliano Zapata (1879–1919), a popular hero of the Mexican revolution. Type specimens to be left with British Museum (Natural History) and the University of Arizona.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 297 , March 1972 , pp. 541 - 544
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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Footnotes

1

Permanent address: Phelps Dodge Corporation, Douglas, Arizona, 85607, U.S.A.

References

Hey, (M.H.), 1939. On the presentation of chemical analyses of minerals. Min. Mag. 25, 402-12.Google Scholar
Hey, (M.H.), 1954. A further note on the presentation of chemical analyses of minerals. Ibid. 30, 481-97.Google Scholar
Millon, (R.P.), 1969. Zapata, the ideology of a peasaht revolution. International Publishers, New York, N.Y.Google Scholar
Womack, (J.), 1969. Zapata and the Mexican revolution. A. Knopf, New York, N.Y.Google Scholar