ISSN

print 2570-7337
online 2570-7345

Chalconatronite, Na2Cu(CO3)2(H2O)3, from the „sv. Duch“ vein, Jáchymov (Czech Republic)


Volume 21, issue 2 (2013), pages 228-233

Keywords

Abstract

An interesting association of rare carbonate minerals was found in the dump material at the Dušní (Gesiter) vein in Jáchymov, Czech Republic. The mineral assemblage is represented by chalconatronite and abundant čejkaite. Moreover, additional mineral phase was found to be growing inside chalconatronite aggregate. It goes most probably about Na-Ca carbonate, pirsonnite or gaylussite, however, the exact identification cannot be done. Chemical composition of the studied chalconatronite was determined base on electron microprobe data. The empirical formula can be expressed as Na2.01(Cu0.98Fe0.01)Σ0.99[(PO4)0.02(AsO4)0.01(SiO4)0.01]Σ0.04(CO3)1.95 . 3H2O (mean of 4 spot analyzes; Na+Cu+Fe = 3 apfu). The refined unit-cell parameters of chalconatronite from the powder X-ray diffraction data (for the monoclinic space group P21/n) are a = 9.699(4), b = 6.098(3), c = 13.792(6) Å, β = 91.88(4)° and with V = 815.3(4) Å3.

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