Are all good conductors of heat good conductors of electricity? ?

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It sort of depends on your definition of what good is but I would say that not all good conductors of heat are good conductors of electricity.

As far as I am aware , all good conductors of electricity are also pretty good conductors of heat though.

The trouble is I don't have any good references supporting these views.

http://hyperphysics.phy-astr.gsu.edu/hbase/tables/thrcn.html
shows diamond thermal conductivity better than silver.

I don't know an example with good electrical but poor thermal conductivity. This doesn't mean that there isn't one though - maybe if you look up "specific heat"+"electron gas" you can convince yourself.
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Hi ankush_wah, why can't we mention mica as that one which conducts heat somehow but an insulator for electric current. We often see mica coverage over the heating element in case of iron box. Hope I am correct to some extent....Show more