ISSN
print 2570-7337
online 2570-7345
Kleemanit, vzácný fosforečnan z Krásna u Horního Slavkova, Česká republika
Kleemanite, a rare phosphate from Krásno near Horní Slavkov, Czech Republic
Klíčová slova
Abstrakt
A very rare secondary Zn-Al phosphate, kleemanite, was found in association with Al-rich chalcosiderite and krásnoite on samples from the Huber stock in the Krásno deposit near Horní Slavkov (Karlovy Vary Region, Czech Republic). Kleemanite forms small white needle-like to fibrous crystals clustering into urchin-like aggregates up to 2 mm in size. Individual crystals reach a length of up to 0.5 mm. The mineral grows on the walls of the corrosion cavity of the fluorapatite aggregate in quartz gangue. Its chemical composition corresponds to the empirical formula Zn1.02(Al2.04 Fe0.09)Σ2.13(PO4)2.00[(OH)2.41(F)0.04]Σ2.45·3H2O. Kleemanite is monoclinic, unit-cell parameters refined from X-ray powder diffraction data are a 7.286(8), b 7.194(5), c 9.774(8) Å, β 110.2(6)° and V 480.9(7) Å3. The Raman spectrum of kleemanite has not been published before and is included in this paper.
Online 26.12.2023
Soubory
Reference
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