Heat-resistant mineral is electrochemically bonded (4)

I believe the answer is:

mica

I'm a little stuck... Click here to teach me more about this clue!

'heat-resistant mineral' is the definition.
(I've seen this in another clue)

'electrochemically bonded' is the wordplay.
'MICA' is hidden in amongst the letters.
However, I'm uncertain how this is indicated.

'is' is the link.

Can you help me to learn more?

(Other definitions for mica that I've seen before include "Semitransparent insulating mineral" , "Flexible mineral found in igneous and metamorphic rocks" , "Shiny silicate mineral" , "Muscovite with perfect cleavage" , "Isinglass" .)

I've seen this clue in The Independent.

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