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Gday all
If its of any assistance, I did some work on andalusite altering to sillimanite psuedomorphs via 'sericite ' from the Broken Hill region of NSW back in the late 70s. Graham Chinner later identified the sericite as margarite.

The reference is
Glen RA. 1979. Evidence for cyclic reactions between andalusite, "sericite" and sillimanite, Mt. Franks Area, Willyama Complex, New South Wales . Tectonophysics, 58, 58: 97-112

Dick Glen
Geological Survey of New South Wales






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