ISSN
print 2570-7337
online 2570-7345
Zeolite mineralization with stellerite from the Malý Jelení vrch hill near Stráž pod Ralskem (Czech Republic)
Keywords
Abstract
A zeolite mineralization (stellerite, chabazite-K, heulandite-Ca, lévyne-Ca and erionite-Ca) in tiny cavities of Cenozoic basaltic rocks was sampled at the Malý Jelení vrch hill (500 m above sea level) near Stráž pod Ralskem, northern Bohemia (Czech Republic) and studied by means of electron microprobe and X-ray powder diffraction. Stellerite is the most interesting zeolite in association, this find is its second confirmed occurrence in the Czech Republic. Stellerite forms colourless to white prismatic crystals up to 3 mm in size and rare fan-shaped aggregates up to 1 cm in size. It is orthorhombic, space group Fmmm, the unit-cell parameters refined from X-ray powder diffraction data are: a 13.614(2), b 18.226(2), c 17.862(2) Å and V 4432.1(9) Å3. Its chemical analyses correspond to the empirical formula (Ca4.23K0.53)Σ4.76(Si27.64Al8.11)O72·28 H2O on basis of 72 atoms of oxygen. The time sequence of crystallization of described mineralization at the Malý Jelení vrch hill is as follows: heulandite-Ca - stellerite - chabazite-K - lévyne-Ca - erionite-Ca - calcite.
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References
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