Open AccessVzácný allanpringit - produkt alterace fluorwavellitu z lomu Milina u Zaječova (Česká republika)
Author(s) -
Luboš Vrtiška,
Václav Zemek,
Radana Malíková
Publication year - 2020
Publication title -
bulletin mineralogie petrologie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.239
H-Index - 10
eISSN - 2570-7345
pISSN - 2570-7337
DOI - 10.46861/bmp.28.126
Subject(s) - czech , ordovician , crystallography , geochemistry , jarosite , scanning electron microscope , chemistry , geology , mineralogy , materials science , composite material , philosophy , linguistics
A very rare phosphate allanpringite was found in the abandoned quarry Milina near Zaječov, Czech Republic in Ordovician sediments of the Barrandian area. Allanpringite forms yellow powder and earthy aggregates. In a more detailed study using SEM microscope, allanpringite forms rod-shaped and tabular crystals. Its origin is associated with alteration of fluorwavellite. Empirical formula of the allanprigite is (Fe2.70Al0.24)Σ2.94(PO4)2.00(OH)2.83·5H2O and refined unit-cell parameters are a 9.774(5), b 7.361(3), c 17.826(8) Å, β 92.2(6)° and V 1281.5(9) Å3. Allanpringite was found in association with jarosite, variscite and partly altered fluorwavellite.