In black diamond the rust is extremely compact and has a hardness of 6% to 7 on the mohs scale.
(the rust; is; extremely compact; L:In black diamond) (the rust; has; a hardness of 6% to 7 on the mohs scale; L:In black diamond)
the rust the rust
is has
extremely compact L:In black diamond
a hardness of 6% to 7 on the mohs scale L:In black diamond