Ed,
You are right. Of course there is charge balance even for one single ion
that is substituted. But for the low concentrations of <5 ppm this could be
managed by vacancies, Al - Si sub., Fe3+, H, other trace elements,... It
wouldn't be possible to detect the actual substitution partner in Olivin
for 1 or 2 ppm Li.
horst
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Horst Marschall
Mineralogisches Institut
Universitaet Heidelberg
INF 236
69120 Heidelberg
++49-(0)6221-546021
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