I know of the (split-leaf prone) intergeneric
xGraptoveria 'Amethorum' & the
Graptopetalum amethystinum (one of the parents of the above named plant).
But
Echeveria amethystinum sounds like what your friend said was an incorrectly named plant. I found a pic online that someone has tagged as that. It does look similar to your plant (but not quite).
CARLABRAUER.COM: photography I believe there is no such named species.
The plant shown at Roraima looks like someone couldn't decide on a name for it, so called it a "narrow leaf form".
I realize I'm just throwing more mud in the mix & not helping you much.
