NJG56-1-01
1976
Two refinements for the calculation of structural formulae for pyroxenes and amphiboles
56
1
1-6

In minerals analyzed by electron microprobe, the ferric to ferrous iron ratio is not known. The advantages of calculating the structural formulae for these minerals on the basis of their number of cations rather than oxygens is discussed. A simple method for estimating the ferric to ferrous iron ratio for minerals with a fixed ratio of cations to oxygens is outlined.

0029-196X
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