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

• 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
• 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).

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