Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-24T13:15:17.834Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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
Skvortsova, K.V., Sidorenko, G.A., Nesterova, Yu. S., Arapova, G.A., Dara, A.D., and Rybakova, L.I. (1971. Ibid. 100, 603-11 (in Russian).Google Scholar
Williams, S.A. (1986) Bol. Min.in press.Google Scholar