Oxy-schorl, Na(Fe22+Al)Al6Si6O18(BO3)3(OH)3O, a new mineral from Zlatá Idka, Slovak Republic and Přibyslavice, Czech Republic

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Authors	BAČÍK Peter CEMPÍREK Jan UHER Pavel NOVÁK Milan OZDÍN Daniel FILIP Jan ŠKODA Radek BREITER Karel KLEMENTOVÁ Mariana ĎUĎA Rudolf GROAT Lee
Year of publication	2013
Type	Article in Periodical
Magazine / Source	American Mineralogist
MU Faculty or unit	Faculty of Science
Citation
Doi	http://dx.doi.org/10.2138/am.2013.4293
Field	Geology and mineralogy
Keywords	tourmaline; oxy-schorl; structure; composition; Slovakia; Czech Republic
Description	Oxy-schorl (IMA 2011-011), ideally Na(Fe22+Al)Al6Si6O18(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup, is described from Zlatá Idka, Slovak Republic and Přibyslavice, Czech Republic. Oxy-schorl is derived from schorl end-member by the AlOFe–1(OH)–1 substitution. The studied crystals of oxy-schorl represent two distinct ordering mechanisms: disorder of R2+ and R3+ cations in octahedral sites and all O ordered in the W site (Zlatá Idka), and R2+ and R3+ cations ordered in the Y and Z sites and O disordered in the V and W sites (Přibyslavice).
Related projects:	Chemical composition and structural order of natural tourmalines - geochemical versus crystal-structural constraints