Abstract
A rare intermediate member of the scorodite - strengite series with an extraordinarily high degree of the anionic P for As substitution, technically a scorodite extremely rich in phosporus, scorodite56 - strengite41 (Scd56 - Stg41), was found and identified from mine dump material of the Rejzské pásmo Lode of the Kutná Hora ore district, Czech Republic. The mineral forms fine-grained, light brownish yellow crystalline masses and coatings, several milimeters in thickness on areas of tens of cm2 on the surface of drusy quartz gangue with partially corroded galena and arsenopyrite. Chemical analyses revealed substantial amount of anionic phosphorus substituting for arsenic, ranging from 39.0 to 44.1 at. % of P (mean 41.0 %). Its chemical composition (mean of nine point analyses) corresponds to the empirical formula (Fe3+0.93Al0.03Pb0.01)Σ0.97[(As0.56P0.41S0.03)Σ1.00O4.00]·2H2O. Such a scope of the P for As substitution in members of the scorodite - strengite series is rare and exceptional. X-ray powder diffraction data, unit-cell parameters and space group for the intermediate member are reported [a = 8.844(2) Å, b = 9.969(2) Å, c = 10.247(2) Å, unit-cell volume V = 903.39 Å3, Z = 8 and space group Pbca]. No discontinuation of the solid solution between scorodite and strengite has been observed, X-ray powder difraction analysis unambiguously confirmed the existence of a single phase representing an intermediate member.
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