Publication details
Mineralogická charakteristika a chemismus Fe-gahnitu z Cetoraze u Pacova, Česká republika
| Title in English | Mineralogy and chemical composition of Fe-gahnite from Cetoraz near Pacov, Czech Republic |
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| Authors | |
| Year of publication | 2013 |
| Type | Article in Periodical |
| Magazine / Source | Bulletin mineralogicko-petrologického oddělení Národního muzea v Praze |
| MU Faculty or unit | |
| Citation | |
| Field | Geology and mineralogy |
| Keywords | gahnite;greisen;Cetoraz;Moldanubian |
| Description | Macroscopic crystals and grains of Fe-bearing gahnite with diameter 2 – 4 mm occur in quartz veins and layers of muscovite-biotite orthogneisses eastern of Cetoraz near Pacov. Chemical composition of the studied Fe-gahnite is quite similar to other methamorphosed occurences of gahnite connected with Zn-sulphidic ores or gahnite from Al-rich metasediments (27 – 28 % of hercynite, 8 % of spinel and 1 % of galaxite end member). Sphalerite is supposed to be original source of Zn, especially regarding to association of gahnite and pyrite. Retrograde methamorphosis of Cetoraz gneisses resulted in alteration of gahnite by thin muscovite (sericite) rims and sometimes pseudomorphs of muscovite after gahnite. |