Stability of genthelvite, Zn4(BeSiO4)3S: an exercise in chalcophilicity using exchange operators

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Abstract

Despite differences in ionic radii and chemical affinities, Be and Zn have somewhat similar crystal chemical tendencies, although they rarely occur together in minerals. The only silicate in which they do so is genthelvite, a rare accessory in alkaline to peralkaline granites, syenites, and related pegmatites and greisens. The formula of genthelvite, Zn4(BeSiO4)3S, can be expressed as a mixture of phenakite, willemite, and sphalerite. This fact, plus the fact that Zn is much more chalcophile than Be, allows the prediction of a series of seven sulfide-silicate reactions that involve SO-1 (the "acid anhydrite' of H2S) and the seven phases sphalerite, bromellite, zincite, phenakite, willemite, genthelvite, and quartz. Addition of Al2O3 and F2O-1 to the model system gives further information on the stability of genthelvite. -from Author

Original languageEnglish (US)
Pages (from-to)1384-1394
Number of pages11
JournalAmerican Mineralogist
Volume73
Issue number11-12
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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