I have handled lots of antiquities over the last 30 years.
I also personally inspected the Sha Na Ra crystal skull,
and it is not an authentic artifact.
Most of the skulls are bogus,
as was shown in British museum tests,
though the aspect of later copper wheel polishing is not addressed.
The story behind Sha Na Ra is just as bogus,
with ... I forget the clown's name...
well he hiked off into the Mexican outback with a group
of Bozos and suddenly said psychicly,
"we dig right here!"
and supposedly they dug down and found Sh Na Ra
below a slab in a tomb
BUT
as far as POWER is concerned, the quartz crystal matrix
of the Sha Na Ra crystal skull has had so much viable
positive infusions of human consciousness
that it has become a vesicle and transmitter of such energies.
the skull is placed in a small dark room on a pedestal table,
with multi colored lightings emanating from a source
guiding the light thru a hole from below
where the the skull sits.
It is absolutely incredible to witness the light show,
believe me,
and though the skull itself is not an artifact,
it has amazing energies within the matrix stored.