Silicon grease

[Rich]

Silicon is not classed as a metal, it is a metalloid, it does not conduct electricity in all circumstances, it's a semiconductor and that's what makes it useful.

[Turnup]

Silicon is not classed as a metal, it is a metalloid, it does not conduct electricity in all circumstances, it's a semiconductor and that's what makes it useful.

Well probably yes but......"metalloid" is something of an oddball term since there is no agreed common set of characteristics which qualifies a metalloid and therefore the term is not useful in classification. Knowing that x is considered by some to be a metalloid is useless in determining what characteristics it actually has, and there is not even complete agreement on which elements are metalloids. Best interpretation is "similar in some respects to a metal". Not at all a useful classification.

And in continued pedant mode - Silicon is useful not only because it is a semiconductor. It is a component of Silicone and its semiconductivity is irrelevant in this context.