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Hakite from Příbram, Czech Republic: compositional variability, crystal structure and the role in Se mineralization

Published online by Cambridge University Press:  02 January 2018

P. Škácha ,
J. Sejkora ,
L. Palatinus ,
E. Makovicky ,
J. Plášil ,
I. Macek  and
V. Goliáš
P. Škácha*
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University in Prague, Albertov 6, CZ–128 43, Prague 2, Czech Republic Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, Prague 9 - Horní Počernice, 193 00, Czech Republic Mining muzeum Příbram, Hynka Kličky Place 293, Příbram VI, 261 01
J. Sejkora
Affiliation:
Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, Prague 9 - Horní Počernice, 193 00, Czech Republic
L. Palatinus
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, Prague 8, 182 21, Czech Republic
E. Makovicky
Affiliation:
Department of Geosciences and Natural Resource Management, University of Copenhagen, Østervoldgade 10, 1350 Copenhagen K, Denmark
J. Plášil
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, Prague 8, 182 21, Czech Republic
I. Macek
Affiliation:
Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, Prague 9 - Horní Počernice, 193 00, Czech Republic Department of Geological Sciences, Faculty of Science, Masaryk University, Kotlářská 2, 602 00, Brno, Czech Republic
V. Goliáš
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University in Prague, Albertov 6, CZ–128 43, Prague 2, Czech Republic
*
*E-mail: [email protected]
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Abstract

Hakite, ideally Cu10Hg2Sb4Se13, is a Se-dominant member of the tetrahedrite group occurring at only a few localities in the World. A new occurrence of this mineral in the Příbram uranium and base-metal ore district, Central Bohemia, Czech Republic, is reported in this paper. Hakite was found to be locally abundant and was identified in several samples with Se mineralization. Three chemically distinct types of hakite were distinguished based on electron microprobe study, Hg-rich hakite (hakite sensu stricto), Zn-rich hakite and Cd-rich hakite. Hg-hakite dominates among the samples studied. Its average empirical formula based on 29 apfu (n = 54) is (Cu5.61Ag0.39)∑6.00Cu4.00(Hg1.61Zn0.20Cu0.19Cd0.15Fe0.04)∑2.19(Sb3.85As0.28)∑4.13(Se11.55S1.14)∑12.69 . Less common is the Zn-hakite, (Cu5.80Ag0.20)∑6.00Cu4.00(Zn1.33Hg0.42Cd0.22Cu0.18Fe0.01)∑2.16(Sb3.85As0.26)∑4.11(Se10.92S1.81)∑12.73 (n = 22), and rare Cd-hakite has an empirical formula (n = 7) of (Cu5.84Ag0.16)∑6.00Cu4.00(Cd1.27Zn0.60Cu0.10Hg0.07Fe0.02)∑2.06(Sb4.00As0.19)∑4.19(Se12.14S0.61)∑12.75. The refined unit cell of Hg-hakite from Příbram, obtained from powder X-ray diffraction data, is a = 10.8783(3) Å with V = 1287.3(1) Å3 (Z = 4, for the cubic space group I4̄3m). Structure refinement from the precession electron diffraction data collected on the transmission electron microscope (R = 24.4% for 424 observed reflections), confirmed that hakite is isostructural with tetrahedrite. The evolution of hydrothermal fluids, from which Se mineralization formed, suggests a distinct enrichment in sulfur and depletion in selenium over the time span of crystallization.

Keywords

hakiteselenidestetrahedrite groupcrystal structurePříbramuranium districtanalysesdiffraction data
Type
Research Article
Information
Mineralogical Magazine , Volume 80 , Issue 6 , October 2016 , pp. 1115 - 1128
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2016

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