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print 2570-7337
online 2570-7345

Zeolite mineralization from Svor near Nový Bor (Czech Republic)


Volume 24, issue 2 (2016), pages 194-204

Keywords

Abstract

An interesting zeolite association has been found at an unnamed hill (altitude 455 m) near the Svor village, 7 km NE of Nový Bor (Czech Republic). Zeolites were found in the cavities located at the contact of basalt, vulcanite tuffs and breccia. The most abundant zeolite, offretite, occurs as acicular crystals up to 1 mm in length, rarely also forms sheaf-like and hemispheric clusters. It is monoclinic, space group P-6m2 with unit-cell parameters: a 13.283(9), c 7.6115(3) Å and V 1163.0(8) Å3. Chemical analyses of offretite correspond to the empirical formula K1.10Na0.03Ca1.01Mg0.48(Si12.87Al5.21Fe0.15)O36.15 H2O. Heulandite-Ca, forms twins of hemispheric shapes or fan-like twins up to 2 mm across. It is monoclinic, space group C2/m with unit-cell parameters: a 17.726(4), b 17.829(4), c 7.428(2) Å, β 116.32(1)° and V 2104.2(9) Å3. On the basis of chemical composition, two varieties of heulandite-Ca were determined, the Mg-rich one with empirical formula (Ca1.87Mg1.25Sr0.05Ba0.01K0.84Na0.20)Σ4.22(Si28.56Al7.46)O72.26 H2O and Ba-rich one with empirical formula (Ca1.99K1.51Ba1.35Na0.31)5.16(Si26.99Al9.18)O72.26 H2O. Two other zeolite species, chabazite-Ca and phillipsite-K were also found in the observed association.

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