
As the Indiana Jones movie with
Crystal Skulls delights audiences I found the website of the
Mitchell-Hedges skull and it talks of the experiments scientists at HP Labs conducted on it in 1970.
"In one of the tests the skull was submersed in a glass chamber
containing benzyl alcohol of exactly the same density and refractive
index as pure quartz. As the skull was lowered into the tank it seemed
to disappear. This proved that it was made of the most incredibly pure
type of quartz. But not only was it pure, it was also natural “rock
crystal supplied by the earth”. Polarized light was directed at the
skull in its chamber and vague shadows or ‘veils’ then appeared, which
showed that the skull was of natural origin. These shadows, tiny
variations in the growth pattern of the crystal, somewhat akin to rings
on a tree, are removed in the precisely controlled environment of
manufactured quartz."
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