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Obradovicite, a new complex arsenate-molybdate from Chuquicamata, Chile

Published online by Cambridge University Press:  05 July 2018

J. J. Finney ,
S. A. Williams  and
R. D. Hamilton
J. J. Finney
Affiliation:
Geology Department, Colorado School of Mines, Golden, Colo. 80401, USA. Globe de Plomo Enterprises, Douglas, Ariz. 85607, USA
R. D. Hamilton
Affiliation:
Geology Department, Colorado School of Mines, Golden, Colo. 80401, USA. Globe de Plomo Enterprises, Douglas, Ariz. 85607, USA
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Abstract

Obradovicite, ideal formula H4CuFe2(AsO4) (MoO4)5 · 12H2O, occurs as fine pea-green clusters on quartz from Chuquicamata, Chile. Obradovicite is orthorhombic, space group Pcnm; a = 15.046, b = 14.848, c = 11.056 Å, Z = 4. The strongest powder pattern lines are (d Å, I, hkl) 10.565(8)(110), 8.906(10)(101), 7.424(8)(020), 5.733(5)(211), 3.761(3)(400), 3.686(4)(032), 3.466(3)(411), 3.344(4)(420). It is biaxial positive with α = 1.790, β = 1.798, γ = 1.811, 2Vz = 81°, a = Z, b = X, c = Y, with strong dispersion and pale yellow pleochroism. Specific gravity is 3.55 (meas.) or 3.68 (calc.) and the Mohs hardness is 2½ with no obvious cleavage. Obradovicite is similar to betpakdalite and sodium-betpakdalite except that it contains essential Cu and K (K > Na).

Keywords

obradovicitenew mineralarsenatesmolybdatesChuquicamataChile
Type
Mineralogy
Information
Mineralogical Magazine , Volume 50 , Issue 356 , June 1986 , pp. 283 - 284
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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References

Egorov, B.L., Dara, A.D., and Senderova, V.M. (1969) Zap. Vses. Mineral. Obshch, 98, 207-12.(in Russian).Google Scholar
Ermilova, L.P., and Senderova, V.M. (1961. Ibid. 90, 425-30 (in Russian).Google Scholar
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