Meneghinit a boulangerit z lomu Prachovice v Železných horách, Česká republika
Jiří Litochleb, Jiří Sejkora, Pavel Škácha, Viktor Venclík, Jakub Plášil
Two new primary ore minerals, meneghinite and boulangerite, were found in the active quarry near Prachovice in the Železné hory Mountains, Czech Republic. Both minerals and galena intergrow in silver-grey needle aggregates up to 6 cm on fissures of the silurian and devonian limestones. Meneghinite is orthorhombic with a = 11.3639(5), b = 24.0950(9), c = 4.1437(4) Å, V = 1134.61(4) Å3, and empirical formula (mean of six analyses, base 45 apfu): Pb12.92Cu0.91 (Sb7.03Bi0.07As0.04)Σ7.14(S23.88Se0.15)Σ24.03. Boulangerite is orthorhombic with a = 23.4990(4), b = 21.1911(2), c = 4.0329(1) Å, V = 2008.23(6) Å3, and empirical formula (mean of four analyses, base 20 apfu): Pb5.03(Sb3.94Bi0.04As0.03)Σ4.01(S10.91 Se0.06)Σ10.97. Cerussite and mimetite were determined according to PXRD and EPMA study as a supergene (sub)recent phases originated by weathering of ore minerals.