Bulletin Mineralogie Petrologie

Laumontite was found in the altered, Miocene pyroxenic andesite at the Píla village (Žarnovica district), Pohronský Inovec Mts. It forms white, fine-crystallic fillings of cracks (up to 3 mm thick) in andesite. Laumontite crystals have prismatic or tabular shape, their average size ranges about 0.3 - 0.5 mm (sporadically occur in size of 1 - 3.5 mm). It was identified by powder XRD analysis, the main diffraction maxima with intensities are: 9.441(100), 6.836(41), 4.153(55), 3.504(35), 3,266(19), 2,875(13), 2,438(12). Unit cell parameters are: a = 14.741(1) Å, b = 13.075(1) Å, c = 7.553(1) Å, β = 111.964(4)°, V = 1349.9(1) ų. Diffraction pattern, just like the unit cell parameters, indicate partially dehydration of this laumontite (its transformation to leonhardite). Chemical composition of studied zeolite is close to the normal laumontite formula. Admixtures in mineral structure are represented by slightly increased contents of Fe, Na and K (together ~ 0.28 apfu).

Baerlocher Ch., McCusker L. B. (1996) Database of Zeolite Structures. Prístup 3. februára 2016 na adrese http://www.iza-structure.org/databases/

Coombs D. S. (1952) Cell size, optical properties and chemical composition of laumontite and leonhardite. Am. Miner. 37, 10, 812-829.

Downs R. T., Hall-Wallace M. (2003) The American Mineralogist crystal structure database. Am. Miner. 88, 247-250.

Ďuďa R., Ozdín D. (2012) Minerály Slovenska. 1-480, Granit, Praha.

Fersman A. E. (1908) Materialien zur untersuchung der zeolite Russlands. I. Leonhardit und laumontit aus der umgebung von Simferopol (Krim). Trav. de Museé géol. Pierre le Grand pr. l' Acad. Imp. de Science St Pétersbourg. 2, 103-150.

Fridriksson T., Bish D. L., Bird K. D. (2003) Hydrogen-bonded water in laumontite I: X-ray powder diffraction study of water site occupancy and structural changes in laumontite during room-temperature isothermal hydration/dehydration. Am. Miner. 88, 277-287.

Holland T. J. B., Redfern S. A. T. (1997) Unit cell refinement from powder diffraction data: the use of regression diagnostics. Miner. Mag. 61, 65-77.

Koděra M., Andrusovová-Vlčeková G., Belešová O., Briatková D., Dávidová Š., Fejdiová V., Hurai V., Chovan M., Nelišerová E., Ženiš P. (1989-1990): Topografická mineralógia Slovenska, I-III. 1-1590, Veda - vydavateľstvo SAV, Bratislava.

Konečný V., Lexa J., Halouzka R., Dublan L., Šimon L., Stolár M., Nagy A., Polák M., Vozár J., Havrila M., Pristaš J. (1998a) Geologická mapa Štiavnických vrchov a Pohronského Inovca, M 1: 50 000. MŽP SR – GSSR, Bratislava.

Konečný V., Lexa J., Halouzka R., Hók J., Vozár J., Dublan L., Nagy A., Šimon L., Havrila M., Ivanička J., Hojstričová V., Mihaliková A., Vozárová A., Konečný P., Kováčiková M., Filo M., Marcin D., Klukanová A., Liščák P., Žáková E. (1998b) Vysvetlivky ku geologickej mape Štiavnických vrchov a Pohronského Inovca (štiavnický stratovulkán), M 1: 50 000. Vol. I, II. 1-473, GSSR, Bratislava.

Liou J. G. (1971) Stilbite-laumontite equilibrium. Contr. Mineral. Petrol. 31, 171-177.

Liszkay G. (1877) A tetradymit lelhelyéröl Zsupkón. Zsarnoca vidéki fémtelepek. Az asbestnek agy új lelhelyéröl. Pyrolusitek Tiszolcon. Tiszolci márványfajok. Földt. Közl. 7, 9, 255-263.

Neuhoff P. S., Bird D. K. (2001) Partial dehydration of laumontite: thermodynamic constrains and petrogenetic implications. Miner. Mag. 65, 1, 59-70.

Ondruš P. (1993) ZDS - A computer program for analysis of X-ray powder diffraction patterns. Materials Science Forum, 133-136, 297-300, EPDIC-2. Enchede.

Ozdín D., Majzlan J. (1996) Nové výskyty zeolitov v stredoslovenských neovulkanitoch. Minerál 4, 2, 135-136.

Sunderman R. G. (1983) An X-ray study of unit cell parameter variation in laumontite and leonhardite. Senior thesis. The Ohio State University, Columbus.

Tóth M. (1882) Magyarország ásványai különös tekintettel termőhelyeik megállapítására. 1-509, Nyomatott a Hunadi Mátyás intézetben, Budapest.