Bulletin Mineralogie Petrologie

Tvrdý Jaromír, Vrtiška Luboš, Dolníček Zdeněk, Malíková Radana

Volume 31, issue 2 (2023), pages 209-216

DOI: https://doi.org/10.46861/bmp.31.209

zeolite, stellerite, fluorapophyllite-(K), chabazite-Ca, powder X-ray diffraction data, unit-cell parameters, chemical composition, Košťálov, Czech Republic

Stellerite was discovered in an active quarry at Košt’álov near Semily (Liberec Region, Czech Republic). The mine- ral occurs on fractures of Paleozoic basaltic andesite in association with fluorapophyllite-(K), chabazite-Ca and calcite.Stellerite forms clear columnar striated crystals reaching 1.5 mm in size. Unit cell parameters derived from the powder X-ray data are: a 13.586(6) Å, b 18.204(7) Å, c 17.839(12) Å and V 4412(2) ų. Chemical analyses gave the empirical formula (Ca_3.97Na_0.08 K_0.03)_Σ4.08(Si_28.22Al_7.69)O₇₂·28 H₂O. Transparent colourless dipyramidal and prismatic crystals of fluor- apophyllite-(K) are up to 4 mm in size. The chemical analyses correspond to the empirical formula K_0.73Na_0.10Ca_3.98 (Si_7.78Al_0.22)_Σ8.00O₂₀(F_0.94OH_0.06)_Σ1.00·8 H₂O. Chabazite-Ca with an empirical formula (Ca_1.34K_1.02Na_0.67Ba_0.10Sr_0.01)[Al_3.22 Si_8.44O₂₄]·12 H₂O forms intergrowths of colourless rhombohedrons up to 6 mm in size. Chabazite-Ca contains very small, elongated inclusions of baryte. Calcite in groups of colourless to pale cream scalenohedral crystals up to 2 mm in size is the youngest mineral of the mineral assemblage. In the case of stellerite this is the first description within the Czech Republic, in the case of fluorapophyllite-(K) it is the first detailed characterization from the locality of Košt’álov.

Online 26.12.2023

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