Tschernichit, garronit-Ca a doprovodná zeolitová mineralizace z Jehly u České Kamenice (Česká republika)

Publication Type:Journal Article
Year of Publication:2015
Authors:Pauliš, P, Hrůzek, L, Janeček, O, Sejkora, J, Malíková, R, Pour, O, Fediuk, F
Journal:Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze
Volume:23
Issue:2
Start Page:147
Pagination:24
ISSN:1211-0329
Keywords:analcime, chabazite-Ca, chemical composition, cowlesite, Czech Republic, erionite-K, garronite-Ca, gismondine, heulandite-Ca, Jehla near Česká Kamenice, lévyne-Ca, natrolite, phillipsite-Ca, powder X-ray diffraction data, stilbite-Ca, thomsonite-Ca, tschernichite, unit-cell parameters
Abstract:

The Jehla hill (478 m) occurrence is located about 1 km NE from Česká Kamenice, 15 km ENE from Děčín, northern Bohemia, Czech Republic. Thirteen zeolite species were recently determined from cavities of neovulcanite rocks at this locality. The most interesting finds are very rare tschernichite and garronite-Ca. Tschernichite forms clear very tiny dipyramidal crystals with glassy luster up to 1 mm in size. It is tetragonal, space group P422, the unit-cell parameters refined from the powder X-ray data, are a 12.636(9), c 26.6095(4) Å and V 4249(3) Å3. Chemical analyses of tschernichite correspond to the empirical formula Ca0.48Mg0.07Na0.04K0.14(Si6.49Al1.59)O16.8H2O. Garronite-Ca forms large, milky-white radial aggregates up to 1 cm in size. It is tetragonal, space group I-4m2, the unit cell parameters refined from the powder X-ray data are: a 9.865(7), c 10.2610(6) Å and V 998.6(7) Å 3. Chemical analyses of garronite-Ca correspond to the empirical formula Na0.35K0.04Ca3.25(Al6.51Si9.40)O32 ·14H2O. Other zeolite species detected at this site are analcime, cowlesite, erionite-K, gismondine, heulandite-Ca, chabazite-Ca, lévyne-Ca, natrolite, phillipsite-Ca, stilbite-Ca and thomsonite-Ca. Their descriptions, X-ray powder diffraction data, refined unit-cell parameters and chemical compositions are given in the paper.

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith