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

• 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
• 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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