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solid solution



Hello.
I've a question two question about the uses of solid solution function with
PHEEQCI.

-first question: it's possible to calculate a saturation index as regards to
a solid solution?
For example, if I've a water composition with Fe, Mg, SiO2, can I calculate
the S.I. for:

SOLID_SOLUTIONS 1 olivina
Mg(X)Fe(1-X)SiO4
-comp Forsterite 0.9
-comp Fayalite 0.1

or only for the pure phase?

-second question: it's possible to use the solid solution assemblage in the
REACTION function formula with other pure phase mineral. For example
(hypothetical input file):

REACTION 1
Enstatite 1
Hedenbergite 1
SOLID_SOLUTIONS 1 olivina
Mg(X)Fe(1-X)SiO4
-comp Forsterite 0.9
-comp Fayalite 0.1
1 moles in 25 steps

Thank you.
Best Regards.
Tiziano.
***
Tiziano Boschetti
Dipartimento di Scienze della Terra - Università di Parma
(Earth Sciences Department - University of Parma)
Parco Area delle Scienze 157a
43100 Parma, ITALY
Fax:      +39-(0)521-905305
e-mail: tbosche@xxxxxxxxx



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