Dichroic coatings (on glass) are based on metal oxides too. As well as dichroic extract (basically the powdered coating without any glass in it). And both can be used for fusing. Mica is a mineral and larger flakes can boil at lower temperatures (wiki says aluminium silicate minerals). The flakes in question are "dichroic based on metal oxides" - sounds similar to regular dichro but in other form.
As far as I can see from the manual for the product, it is a coe dependent product. It should have glass in it - dichro extract (no glass, just dichro powder) can be used with any coe.
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