ISSN
print 2570-7337
online 2570-7345
Chalcoalumite, Cu2+Al4(SO4)(OH)12(H2O)3, from the Červená vein, Jáchymov (Czech Republic)
Keywords
Abstract
A rare supergene Cu-Al sulfate, mineral chalcoalumite, has been found for the first time in the Czech Republic from Jáchymov. This supergene mineral was found in the material originating from the Červená vein, Rovnost mine (Jáchymov) in an association with other supergene minerals, related by their origin to the acid mine drainage, mostly sulfates of copper and uranium. The chemical composition of the studied chalcoalumite was determined using an electron microprobe. The empirical formula can be expressed as (Cu0.91Fe0.05Ni0.01)Σ0.97Al3.86 [(SO4)0.99(SiO4)0.01]Σ1.00(OH)11.47 . 3H2O (mean of 4 spot analyzes; on the basis of S + Si = 1 apfu). The unit-cell parameters of studied chalcoalumite refined from the powder X-ray diffraction data (for the monoclinic space group P21/n) are a = 10.24(1), b = 8.938(8), c = 17.09(2) Å, β = 95.7(2)° and with V = 1557(3) Å3.
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References
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