My name states I'm a singular male,
(i, Ron probably)
I can have a number, a head, but no tail.
(head is maybe the engine?)
I've also great strength and I can be tough,
(well iron is strong so...)
But I'll smooth things out when they are rough.
(polishing probably
Although I go back to an age now gone,
(because it is a mineral)
I'm around today for everyone.
(well... it is around)
Is that right?