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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