Studium optických anomálií v granátech z Ca-skarnů brněnského, šumperského a žulovského masivu

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Title in English Study of optical anomalies in garnets from Ca-skarns in the Brno massif, Šumperk massif and Žulová massif
Authors

TALLA Dominik LOSOS Zdeněk SULOVSKÝ Petr ČOPJAKOVÁ Renata

Year of publication 2005
Type Article in Periodical
Magazine / Source Geol.výzk. Mor. Slez. v r. 2004
MU Faculty or unit

Faculty of Science

Citation
Field Geology and mineralogy
Keywords Moravo-Silesian Zone; Ca-skarns; optical anizotropy; grossular-andradite; electron microprobe
Description Optical anisotropy commonly occurs in grossular-andradite garnets from different types of Ca-skarns. The difference between the crystal chemistry of isotropic and non-isotropic lamellae is discussed. It is assumed that the substitution of OH groups and fluorine for oxygen or entire SiO4 tetrahedra is the main cause of the occurrence of optical anomalies in the studied samples, rather than Fe3+/Al3+ ordering on the positions of trivalent cations, as some previous authors suggest.
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