ISSN

print 2570-7337
online 2570-7345

Zeolites mineralization with barite from Rousínov near Cvikov in Lužické hory Mountains (Czech Republic)


Volume 23, issue 2 (2015), pages 221-228

Keywords

Abstract

An interesting new occurrence of offretite and harmotome in association with barite was detected in basalts at Rousínovský hrádek near Rousínov, Lužické hory Mountains (Czech Republic). Offretite forms colorless hexagonal acicular crystals up to 0.8 mm in lenght and radial or hemispherical aggregates up to 2 mm across. It is hexagonal, space group P-6m; its unit-cell parameters of offretite, refined from the powder X-ray data, are: a 13.301(4), b 7.621(2) and V 1167.6(3) Å3. Chemical analyses of offretite correspond to the empirical formula K1.02Ca1.02Mg0.76Ba0.04Na0.01Si13.22 (Al4.81Fe0.02)Σ4.83O36·15H2O. Harmotome was found as colorless to whitish crystals and characteristic twins up to 2 mm in size. It is monoclinic, space group P21/m, the unit-cell parameters, refined from the powder X-ray data, are: a 9.887(3), b 14.116(6), c 8.657(3) Å, β 124.58(2)° and V 994.7(6) Å3. Chemical composition of harmotome correspond to the empirical formula (Ba1.96K0.05Na0.04Ca0.03)Σ2.07 (Si11.75Ti0.07)Σ11.82O32·12H2O. Barite forms colorless to white tabular crystals and their groups up to 2 mm in size, it has an increased content of SrO and its empical formula is possible to express as (Ba0.93Sr0.06Ca0.01)Σ1.00SO4. Described locality is interesting by anomalous increased concentrations of barium (occurrence near to end-member harmotome and barite) which had not been found at similar types of zeolite mineralizations in the Czech Republic.

Files

Abstract (PDF) - 216.78KB
Fulltext (PDF) - 3.42MB

References

Alberti A., Cruciani G., Galli E., Vezzalini G. (1966) A reexamination of the crystal structure of the zeolite offretite. Zeolites 17, 457-461.

Coombs D. S., Alberti A., Armbruster T., Artioli G., Colella C., Galli E., Grice J. D., Liebau F., Mandarino J. A., Minato H., Nickel E. H., Passaglia E., Peacor D. R., Quartieri S., Rinaldi R., Ross M., Sheppard R. A., Tillmanns E., Vezzalini G. (1997) Recommended nomenclature for zeolite minerals: report of the subcommittee on zeolites of the International Mineralogical Association, commission on new minerals and mineral names. Can. Mineral. 35, 1571-1606.

Deer A. W., Howie A. R., Wise S. W., Zussman J. (2004) Rock-forming minerals. Framework Silicates: Silica Minerals, Feldspathoids and the Zeolites. 1-982, The Geological Society. London.

Gualtieri A., Artioli G., Passaglia E., Bigi S., Viani A., Hanson J. C. (1998) Crystal structure – crystal chemistry relationships in the zeolites erionite and offretite. Am. Mineral. 83, 590-606.

Laugier J., Bochu B. (2011) LMGP-Suite of Programs for the Interpretation of X-ray Experiments. http://www.ccp14.ac.uk/tutorial/lmgp. přístup duben 2011.

Lorenz W., Kopecký L. et al. (1964) Geologická mapa ČSSR, mapa předčtvrtohorních útvarů 1:200 000, M-33-IX, Děčín-Görlitz. Ústř. úst. geol. Praha.

Novák J. K., Chvátal M., Ulrych J., Wiesner T., Radoň M. (2001) Amygdale mineral paragenesis of trachybasalt from Kočičí hlava hill (Katzenkoppe) near Velké Březno, České Středohoří Mts. Sbor. Prací Univ. Palackého, Geol. 37, 1-26.

Pauliš P., Dvořák Z., Radoň M., Pour O., Malíková R. (2014a) Harmotom a doprovodné minerály z Brné u Ústí nad Labem. Minerál 22, 6, 516-520.

Pauliš P., Hrůzek L., Janeček O., Dvořák Z., Toman J., Svejkovský J., Radoň M. (2015) Nejzajímavější mineralogická naleziště Čech – zeolity a doprovodná mineralizace. 1-280, Kuttna, Kutná Hora.

Pauliš P., Sejkora J., Novák F., Malíková R. (2014b) Harmotom a stilbit-Ca z ložiska polymetalických rud Křižanovice v Železných horách (Česká republika). Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 22, 1, 68-73.

Pauliš P., Svejkovský J., Janeček O., Hrůzek L., Dvořák Z., Jebavá I. (2013) Offretit z kamenolomu Vrbička u Valče v Doupovských horách. Bull. mineral.-petrolog. Odd. Nár. Muz. (Praha) 21, 2, 171-178.

Pouchou J. L., Pichoir F. (1985) “PAP” (φρZ) procedure for improved quantitative microanalysis. In: Microbeam Analysis (J. T. Armstrong, ed.). San Francisco Press, San Francisco, 104-106.

Radoň M. (2006) Nové paleontologické nálezy v terciérních intravulkanických sedimentech Českého středohoří. Zpr. geol. Výzk. v Roce 2005, 94-97.

Stuckenschmidt E., Fuess H., Kvick A. (1990) Investigation of the structure of harmotome by X-ray (293 K, 100 K) and neutron diffraction (15 K). Eur. J. Mineral. 2, 861-874.

Tschernich R. W. (1992) Zeolites of the world. 1-563, Geoscience Press, Phoenix.