A stone as soon as believed to be impenetrable with its stiffness.
an incredibly difficult compound.
A rock or mineral held by some to be of impenetrable stiffness; a name directed at the diamond as well as other substances of extreme hardness.
An embodiment of impregnable stiffness.
A magnet; a lodestone.
A stone thought by some becoming of impenetrable stiffness; a name given to the diamond along with other substances of severe hardness; but in contemporary mineralogy it's no technical signification. It is now a rhetorical or poetical title for the embodiment of impenetrable stiffness.
A name used with increased or less indefiniteness to numerous real or fictional metals or nutrients characterized by extreme stiffness: because the diamond
the all-natural opposite of the diamond
a lodestone or magnet, and
as a whole, any substance of impenetrable or surpassing stiffness; what is impregnable to virtually any power.
quite difficult native crystalline carbon valued as a gem