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The skull was made from a single block of clear quartz (although the jaw detaches), 5 inches high, 7 inches long and 5 inches wide. It is about the size of a small human cranium, with near perfect detail. In 1970, art restorer Frank Dorland claimed that he was given permission to submit the skull to tests at the internal Hewlett-Packard Laboratories. He claimed that the skull featured some anomalies. According to Dorland, the skull had been carved with total disregard to the natural crystal axis and no metal tools were used. Dorland claimed he was unable to find any tell-tale scratch marks, except for traces of mechanical grinding on the teeth. From tiny patterns near the carved surfaces, Dorland determined it was first chiseled into rough form, probably using diamonds. However, no evidence on this matter has been provided by Hewlett-Packard, so it is doubtful whether these tests were ever carried out. The finer shaping, grinding and polishing, Frederick claimed, was done with sand over a period of 150 to 300 years. Norman Hammond later reported holes, intended for support pegs, drilled by metal. Although various claims have been made over the years regarding the skull's physical properties, such as an allegedly constant temperature of 70°F, Dorland reported that it was no different from other natural quartz crystals. Dorland also claimed that the skull's origin was Atlantis and that it had been carried around by the Knights Templar during the crusades.
http://en.wikipedia.org/wiki/Crystal_skull