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On use of hyalophane for K-Ar dating in the Central Bosnian Schists Mts.

Hyalophane, (K, Ba)(AlSi3O8) is a solid solution of celsian and adular (orthoclase) with some albite components. The Bosnian hylophane, together with it's exceptional size, bears some unusual crystallochemical characteristic, 10-20% of albite and 1% NH4+ component (the first record of NH4-containing hyalophane, Beran et al., 1992)

isotope geochronology; K-Ar dating; ammonium hyalophane; activation energy; closure temperature; retrogressive metamorphism; Central Bosnian Schists Mts.

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