Yes I too thought mullite but for the 'stars'was tempted by skeletal
magnetite-probably a spinel of some sort- and certainly a cubic
phase- but I do not know wuestite very well.
Polished thin sections are the only way forward suplemented by
SEM EDAX after putting in the hours looking at the phases and
recgnising their different optical properties- then one analysius will
set you up for life- otherwise you will always have to chemically
analyse each new specimen.
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