Axinite, a Borosilicate with Extensive Fe-Mn Substitutions at the Scale of Monocrystal Revealed by Micro-XRF Imaging and In Situ Analysis: An Example from the Type Locality at Oisans (France)

What is it about?

Axinite, first described on samples from Oisans 2 centuries ago, has been investigated by micro-analytical techniques including Raman spectroscopy, XRD, EMPA and LA-ICP-MS. Axinite from St Christope en Oisans are characterized by a large solid solution between the Fe- and Mn- end-members. Mn content increases with time during crystallization, with the outer growth bands the most enriched. Be, HREE, Sc, Ga, In, and Co are also enriched a a function of the Mn/Fe increase, reflecting changes in the fluid chemistry during crystal growth.

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