But very interesting, thanks. I don't know where to look up on F excess in
apatite analyses (maybe missed it), and like to know.
Ralf
> 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
>
|