The Mitchell-Hedges : The Crystal Skull

Officially found amongst the Mayan ruins in Lubantuun, Belize (at that time, British Honduras) on January 1st, 1924, but nothing was known of this artifact until 1931.
In the autobiography of Mitchell-Hedges – who discovered it together with his adoptive daughter Anna – we find the following information about the Skull, as told to him by the Maya: “[…] made of pure rock crystal and according to scientists it must have taken over 150 years, generation after generation, working all the days of their lives patiently rubbing down with sand an immense block of rock crystal until finally the perfect skull emerged.” He then goes on: “It is at least 3,600 years old and according to legend was used by the High Priest of the Maya when performing esoteric rites.”
The F.A. Mitchell-Hedges skull has one peculiarity: the jaw of the artifact is mobile, and was found at the same site a short while after the main part.
We can surmise that the mobility of the jaw relates to the object's religious function, that it had to replicate a human skull as closely as possible in all its characteristics.

THE DATING ENIGMA

In theory, based on where it was found, the Crystal Skull is probably a Mayan artifact dating back to 1,600 BC.  Ever since it first came to light it has been surrounded by speculation, and many theories have been proposed as to its true origin.
Many experts have attributed it to civilizations even older than the Maya, maybe even Altantis, and long-since disappeared into the mists of time, whilst other theories consider it to be handed down from an alien civilization.
Bill Homann repeatedly said that it is impossible to formulate a precise theory supported by scientific data, because it is impossible to date the object. As with the pyramids of Giza, it undoubtedly exists, but how it came into being is, for the moment, impossible to establish. Some theories maintain that it could be an incredible container of memories of universal knowledge, or even of the various cycles of humanity…a matrix for all of human possibilities in the future.
This is because, given that the Skull is made of piezoelectric quartz crystal, the same material used in computer circuitry, it cannot be dated using scientific methods, because the structure of this type of crystal remains unchanged over time, making normal scientific dating impossible.
We can, however, gain important information on the dating of the Skull from the production method used: nowadays crystals are carved following their axis. This means that in order to avoid breaking the crystal, it must be cut according to its natural structure. In this case, however, the skull was carved with total disregard for the axis. Modern production methods would unavoidably have caused the crystal to break, due to the heat and vibrations created. Another mystery lies in the fact that the skull contains three prisms and two lenses. In order to achieve this using modern technology, zero gravity conditions would be necessary.