Cuprobismutite, kupčíkite, hodrushite and associated sulfosalts from the black shale hosted Ni-Bi-As mineralization at Čierna Lehota, Slovakia

Authors: Pršek, Jaroslav; Mikus, Tom´s; Makovicky, Emil; Chovan, Martin

Source: European Journal of Mineralogy, Volume 17, Number 1, January 2005 , pp. 155-162(8)

Publisher: E. Schweizerbart'sche Verlagsbuchhandlung

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Abstract:

Three sulphosalts from the cuprobismutite homologous series have been found in a hydrothermal Ni-Bi-As mineralization at Čierna Lehota (Slovakia). Kupč;íkite (second world occurrence) has a significant content of Pb (2.73 wt.%) and Fe (0.85 wt.%), with the structural formula (Cu_3.92Fe_0.24)_Σ4.16(Bi_4.60Pb_0.19Ag_0.04Sb_0.01)_Σ4.84S_9.58. Hodrushite has a higher content of Ag (mean 1.27 wt.%), but less Fe (0.59 wt.%) and Pb(0.23 wt.%), with structural formula (Cu_7.79Fe_0.38)_Σ8.17 (Bi_11.34Ag_0.43Pb_0.04Sb_0.02)_Σ11.83S_22.13. Two varieties of cuprobismutite have the highest Ag content (3.8 and 2.3 wt.%), with Fe 0.6 and 0.2 wt.%, and Pb 0.1 and 6.7 wt.%, giving two formulas (Cu_7.42 Fe_0.47)_σ7.87(Bi_12.56Ag_1.55Pb_0.02)_Σ14.13S_24.68 and (Cu_7.67Fe_0.14)_Σ7.81 (Bi_11.95Pb_1.37Ag_0.85Sb_0.02)_Σ14.19S_24.13. Chemical variations between these sulphosalts are compared with published data, that emphasizes the role of minor cations. Associated sulphosalts are described: aikinite, and Bi-rich tennantite (Bi up to 9.7 wt.%).

Keywords: BISMUTH SULPHOSALTS; CUPROBISMUTITE; SERIESKUPCIKITE; HODRUSHITE; CIERNA LEHOTA

Document Type: Research article

DOI: http://dx.doi.org/10.1127/0935-1221/2005/0017-0155

Publication date: 2005-01-01

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