Publication details
Gayit z granitického pegmatitu od Cyrilova u Velkého Meziříčí, moldanubikum
| Title in English | Gayite from granitic pegmatite at Cyrilov near Velké Meziříčí, Moldanubicum |
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| Authors | |
| Year of publication | 2010 |
| Type | Article in Periodical |
| Magazine / Source | Acta Mus. Moraviae, Sci. geol. |
| MU Faculty or unit | |
| Citation | |
| Field | Geology and mineralogy |
| Keywords | gayite; natrodufrenite; secondary phosphates; EMPA; Cyrilov pegmatite; Moldanubicum |
| Description | Gayite, a new dufrenite group mineral with Mn as dominant divalent cation was recently described by Kampf et al. (2010) from beryl-columbite-phosphate type granitic pegmatite in Cordoba province, Argentina. Similar, Mn-dominant member of the dufrenite group occurs in association with natrodufrenite, mitridatite, fluorapatite and crandalite group minerals at the border of the Al-phosphate nodule from Cyrilov pegmatite. Its chemical composition differs from the type locality gayite. The elevated content of Ca (0.18-0.33 apfu; 1.20-2.13 wt.% CaO) and Mg (up to 0.15 apfu Mg (up to 0.68 wt.% MgO) variable Al (0.01-1.03 apfu; 0.05-6.14 wt.% Al2O3) and ratio Mn/(Mn+Fe2+) 0.30-0.81 is typical for natrodufrenite to gayite form Cyrilov. Substitution trends are briefly discussed. |