Shiny material in lilac, imported on reflection (4)

I believe the answer is:

mica

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'shiny material' is the definition.
'mica' can be an answer for 'material' (mica is a kind of material). I am not sure about the 'shiny' bit.

'in lilac imported on reflection' is the wordplay.
'in' says the answer is hidden in the clue.
'on reflection' is a reversal indicator.
'acim' is hidden within 'lilac imported'.
'acim' backwards is 'MICA'.

Can you help me to learn more?

(Other definitions for mica that I've seen before include "Transparent mineral" , "Semitransparent insulating mineral" , "Shiny silicate mineral" , "Muscovite with perfect cleavage" , "Isinglass" .)

I've seen this clue in The Irish Times.

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