Abstract
THE existence of Fe3+ in potassium feldspars is well known and it has been assumed that the iron is substituting for aluminium1. We have been investigating the geochemical characteristics of the Enchanted Rock batholith, Llano Uplift, Texas2,3, and have noted the rubidium–iron covariance reported here (see Fig. 1).
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References
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Ragland, P. C., thesis, Rice University (1962).
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BILLINGS, G., RAGLAND, P. & ADAMS, J. Possible Rubidium–Iron Covariance in Potassium Feldspars. Nature 210, 829–830 (1966). https://doi.org/10.1038/210829a0
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DOI: https://doi.org/10.1038/210829a0
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