Blue, complexly zoned, (Na,Mg,Fe,Li)-rich beryl from quartz-calcite veins in low -grade metamorphosed Fe-deposit Skály near Rýmařov, Czech Republic

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Authors	NOVÁK Milan GADAS Petr FILIP Jan VACULOVIČ Tomáš PŘIKRYL Jan FOJT Bohuslav
Year of publication	2011
Type	Article in Periodical
Magazine / Source	Mineralogy and Petrology
MU Faculty or unit	Faculty of Science
Citation
Doi	http://dx.doi.org/10.1007/s00710-011-0157-7
Field	Geology and mineralogy
Keywords	beryl euclase quartz calcite veins Lahn Dill type Fe deposit Skály
Description	Syn-tectonic quartz-calcite veins containing blue beryl are enclosed in hematite>magnetite-rich portions of the low-grade metamorphosed Fe-deposit Skály near Rýmařov, Czech Republic. Aggregates of pale to deep blue beryl, up to 2 cm in diameter, are associated with euclase, clinochlore, hematite, albite and dravite. Complexly zoned beryl crystals consist of skeletal aggregates of beryl I randomly distributed within volumetrically dominant beryl II with narrow rims of beryl III. All types of beryl have similar contents of Na (0.32-0.49 apfu) and Mg (0.31-0.41 apfu) but variable contents of Fetot (0.05-0.34 apfu) and Al (1.20-1.62 apfu), and elevated contents of Li, up 1314 ppm (0.28 wt.% Li2O) in beryl I.
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