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Hi Folks, here is another resource for mineral formulae recalculation: http://serc.carleton.edu/research_education/equilibria/mineralformulaerecalculation.html Numerous options are included that also recalculate end members of feldspars, amphiboles, pyroxenes, garnets, etc. based on charge balance and cation site occupancy considerations (e.g. also calculating ferric iron-with all the attendant assumptions and problems). With permission, I'll add the spread sheet that Alicia sent to this collection of Excel recalculation programs. Dave Mogk ________________________________ From: Metamorphic Studies Group [mailto:[log in to unmask]] On Behalf Of Alicia Sent: Wednesday, January 27, 2010 5:14 AM To: [log in to unmask] Subject: Re: apatite cation recalculation Dear Moumita, The attached is a generic excel file that you can use to calculate any mineral formula on basis of the oxygen's number. I hope it will be useful for you, Best wishes Alicia De: Metamorphic Studies Group [mailto:[log in to unmask]] En nombre de Moumita Talukdar Enviado el: miércoles, 27 de enero de 2010 12:40 Para: [log in to unmask] Asunto: apatite cation recalculation Dear All, I am working on characterisation of apatite-magnetite mineralisation, of a particular area in India for my M.Sc dissertation. I would be glad if any one can refer me for the procedure of apatite cation recalculation scheme or provide me with some standard excel files for the same. Regards, Moumita Talukdar M.Sc Student Jadavpur University India ________________________________ Your Mail works best with the New Yahoo Optimized IE8. Get it NOW!<http://in.rd.yahoo.com/tagline_ie8_new/*http:/downloads.yahoo.com/in/internetexplorer/>.