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Explanation: Or 'pewter grey coating with mica powders'.
Or 'pewter grey micaceous coating'
Or 'pewter grey pearlescent finish' (it's the mica powders that makes it pearlescent)
Just suggestions as I find nothing definitive on the net. However it is clear that pewter and grey refer to the colour, while mica powder has been added which probably gives it a lustrous pearlescent finish.
Then again, while there are a few instances of micalized on the net (mostly taken from Italian), maybe it's a useful new adjective!