Acta Mineralogica-Petrographica, Abstract Series, Szeged, Vol. 7, 2012 133 MINERALS OF TURQUOISE GROUP FROM SÂNDOMINIC, GURGHIU MTS., ROMANIA AND FROM PARÁDFÜRDŐ, MÁTRA MTS., HUNGARY SZAKÁLL, S.*, KRISTÁLY, F. & ZAJZON, N. Institute of Mineralogy and Geology, University of Miskolc, H-3515 Miskolc-Egyetemváros, Hungary * E-mail:
[email protected] 1) The Sândominic occurrence (Dorma Hill) is lo- with the sulphide-rich plutons at depth. This interaction cated in the southern termination of Gurghiu Mts, East- with Cu-Zn-Fe-rich sulphides produced acidic fluids ern Carpathians, Romania, in the vicinity (~5 km from with leached out ions (Cu-Zn-Fe), which were necessary Fagul Cetăţii deposit) of the Bălan copper ore minerali- to form turquoise group minerals. The source of phos- zation. The site is located on the contact of the Rebra phorus could be the hydrothermally altered rock- metamorphic limestones and Tulgheş Lithogroup. Tur- forming apatite. Here the turquoise mineral (Fig. 1) is a 2+ quoise (Fig. 1) was found as incrustations in a highly solid solution of aheylite (Fe ,Zn)Al6(PO4)4(OH)8 • fractured and oxidized, quartz dominated part of a milo- 4H2O, faustite (Zn,Cu)Al6(PO4)4(OH)8 • 4H2O and nitic rock. In the cracks and voids of quartz it is associ- planerite Al6(PO4)2(PO3OH)2(OH)8 • 4H2O. Similar ated with goethite, occasionally with mm-size euhedral situation was already observed elsewhere (FOORD & quartz. Here the meteoric fluids permeated the meta- TAGGERT, 1998). The mineral appears as pale yellow- morphic rocks creating oxidizing environment, where ish brown hemispheres, up to 0.5 mm in diameter.