Bulletin Mineralogie Petrologie

Vrtiška Luboš, Malíková Radana, Sejkora Jiří

Ročník 24, číslo 1 (2016), strana 114-131

Al-phosphates, plumbogummite, kintoreite, fluorwavellite, variscite, pyromorphite, unit-cell parameters, chemical composition, Líštěnec, Votice, Czech Republic

An interesting phosphate mineral assemblage was found at several sites close to the Líštěnec village near Votice (central Bohemia, Czech Republic). Recently defined fluorwavellite forms light blue to blue spherical aggregates and crusts in fissures of graphitic gneisses (historical sample) or quartz gangue (new finds). It is orthorhombic, space group Pcnm with following unit-cell parameters refined from the X-ray powder diffraction data: a 9.6259(8), b 17.381(2), c 6.9946(6) Å, V 1170.3(2) ų (historical sample) and a 9.635(3), b 17.366(5), c 6.993(2) Å and V 1169.9(6) ų (new finds). Empirical formulae of fluorwavellite from both finds is possible to express as (Al_2.90V_0.03Fe_0.02K_0.01)_Σ2.96(PO₄)_2.00 F_1.00((OH)_1.73F_0.12)_Σ2.85·5H₂O (historical sample) and (Al_2.84V_0.16Fe_0.03Ca_0.02K_0.02Cr_0.02)_Σ3.09(PO₄)_2.00(F_0.81(OH)_0.19)(OH)_2.23·5H₂O (new finds). Variscite occurs as green transparent crusts and aggregates. Samples from both occurrences belong to variscite of Messbach type with following orthorhombic unit-cell parameters: a 9.906(2), b 9.659(2), c 17.175(4) Å, V  643.4(3) ų (historical sample) and a 9.902(3), b 9.654(2), c 17.179(4) Å, V 1642.1(7) ų (new finds). Their empirical formulae are: (Al_0.99V_0.02Fe_0.01)_Σ1.02(PO₄)_0.99F_0.05.2H₂O (historical sample) and (Al_0.94V_0.02Fe_0.03Cr_0.01)_Σ1.00(PO₄)_1.00F_0.06·2H₂O (new finds). Pyromorphite forms crusts and aggegrates at fissures of quartz gangue consisting from yellow to light green crystals up to 5 mm in length. It is hexagonal, space group P6₃/m with unit-cell parameters refined from the X-ray powder diffraction pattern: a 9.985(3), c 7.3365(1) Å and V 633.5(2) ų. Its chemical composition correspond to empirical formula Pb_2.95Ca_0.01(P_2.95As_0.03Cr_0.02)_∑3.00Cl_1.00. Rare plumbogummite was found as white (with yellowish or bluish tint) crusts in small cavities of quartz composed by tiny idiomorphic trigonal crystals. It is trigonal, space group R-3m with following unit-cell parameters refined from X-ray powder difraction data: a 7.033(3), c 16.7534(3) Å and V 717.6(3) ų. Its chemical analyses correspond to Pb-, Al- and P-dominant member of alunite supergroup. Very rare kintoreite occurs as yellow to brownish yellow tiny idiomorphic trigonal crystals in cavities of quartz gangue. Its chemical composition correspond to Pb-, Fe- and P-dominant member of alunite supergroup. An extensive Al-Fe substitution is characteristic for studied plumbogummite and kintoreite.

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