First Answer
Yes it is and it can also withstand heat. For many years mica was used in toasters to make a framework to hold the heating elements.
Next Answer
Actually mica is a very good electrical INSULATOR, but is a good THERMAL conductor, which is why it was used for holding heating elements.
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The poorest insulator would be the best conductor, which is one of the noble metals. Bakelite is a fairly good insulator, not too long ago electrical fittings were made from it.
A candle in not in the electrical classification category as being used for an insulator.
Two good Insulators are foam and styrafoam
is foam dirt an metal a good insulator
Very low. It's used as an insulator.