Oops. As you might have guessed, my last email was intended
for Eric Essene alone.
' Sorry.
Allan
On 1/27/10 10:26 AM, "Eric Essene" <[log in to unmask]> wrote:
> Alicia,
> It doesn't work for F, Cl apatite if it uses O only. The proper
> notation is to positive charges, not O. The amount of oxygen in
> Ca5(PO4)3(OH) is 13, whereas it is only 12 for Ca5(PO4)3Cl. There is
> a big problem getting good analyses of heavy elements (K-U) by EMP
> alone in apatite due to beam damage and systematic gain of false F,
> with concomitant loss of OH, often leading to negative OH values.
> Neglect of the many (usually) minor to negligible elements, some of
> which may have variable valence, can produce systematic formulaic
> errors as well.
> cheers,
> eric
>
>
> On Jan 27, 2010, at 7:14 AM, Alicia wrote:
>
>> Dear Moumita,
>>
>> The attached is a generic excel file that you can use to calculate
>> any mineral formula on basis of the oxygen¹s number. I hope it will
>> be useful for you,
>>
>> Best wishes
>>
>> Alicia
>>
>> De: Metamorphic Studies Group [mailto:GEO-
>> [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!.
>> <formula.xls>
>
Allan H. Treiman
Associate Director for Science
Lunar and Planetary Institute
3600 Bay Area Boulevard
Houston TX 77058-1113
281-486-2117
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