The Mystery of the Crystal Skulls. Chris Morton

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      The crystal skull had not only attracted the attention of archaeologists. Scientists too had been fascinated, intrigued by the skull’s mysterious history and all the incredible possibilities it seemed to represent. When Anna Mitchell-Hedges agreed to loan her skull to a team of scientists at state-of-the-art computer and electronics company Hewlett-Packard, they had the chance to examine the skull in detail.

      Hewlett-Packard is one of the world’s leading manufacturers of computers and other electronic equipment. They use crystals in a whole range of electronic devices. Their scientists therefore are experts not only on computers but also on the physical, technical and scientific properties of crystal.

      The tests on the crystal skull took place in late 1970 in Hewlett-Packard’s crystal laboratories in Santa Clara, California (see plates 34–6). We visited these laboratories, deep in the heart of California’s Silicon Valley, to try to find out what the scientists had discovered.

      The tests had been overseen by Jim Pruett, components manager of the frequency standards team. By the time we arrived in California, he was long gone, but Ceri and I were able to speak to the current principal scientist at the lab, Jack Kusters, and the former engineering manager for quartz devices, Charles Adams, who had been present during the tests. Between them these two men have over 50 years’ experience of working with crystal.

      As Jack and Charles explained, initially the team was not even convinced that the crystal skull was really made of proper quartz. There are in fact several other materials that look almost exactly the same as quartz crystal to the naked eye, including various types of plastics and glass. Even lead crystal, the material from which most glasses, decanters and other decorative objects are now made, is actually a type of glass and not crystal at all. Also, there is a lot of artificially manufactured or ‘synthetic’ quartz crystal around today.

      Natural quartz, or rock crystal, on the other hand, is entirely a product of Mother Nature. It actually grows in the ground, taking sometimes billions of years to form. Crystals grow deep within the Earth’s crust, usually around volcanic and earthquake activity. The process requires immense heat and pressure and always a ‘seed’ crystal is needed to start it off. This seed is created when a single silicon atom, under intense heat and pressure, fuses with two oxygen atoms from superheated water or steam trapped in the same space. The atoms fuse to form a single crystalline cell of silicon dioxide, the substance from which all quartz crystal is made. (The by-product is hydrogen.) Over the millennia, if conditions are right, this seed starts to grow. But the surrounding fluid must contain just the right proportions of silicon and water, or pressurized steam, maintained at a phenomenal intensity of heat and pressure for a sufficiently long period of time. As the primordial fluid oozes over the first cell of silicon dioxide, the cell starts to replicate itself, laying down its complex crystalline structure one atom at a time. Every cell in the crystal repeats the same pattern. Each cell is a tiny little crystal in and of itself, and each cell repeats the same pattern as the one before. In this way the crystal builds up a complex three-dimensional network structure, known as a ‘crystal lattice’, with absolute geometric regularity, where every cell is exactly symmetrical and precisely repeated throughout the whole. And so little by little, over the years, a piece of pure, transparent natural quartz crystal comes into being. In its natural state it is highly angular in shape, always with six sides, tapering at either end to a fine point.

      Of course, not every piece of natural quartz crystal is perfect. Impurities can creep in, traces of iron or aluminium or any number of other substances can get trapped in the network. Such traces of other elements show up as discoloration, aluminium for example turning the crystal smoky grey, known as ‘smoky quartz’, or iron adding a tint of pink, known as ‘rose quartz’, to name but two. High levels of radioactivity can also affect growth and cause discoloration. Only if there is no radio-activity and there are no other trace elements in the area is a totally pure and transparent crystal formed.

      Quartz, however, is one of the most common naturally occurring materials. As Jack told us, current estimates are that around 80 per cent of the Earth’s crust contains quartz. But much of this is too full of impurities or too small to be of any practical use, other than as sand. And, whilst some of the less pure varieties of quartz are still beautiful, they are of relatively little use to the electronics industry. In fact a problem for the industry has been that large and pure pieces of natural quartz are actually very rare.

      Recently this problem has been solved to some extent by the manufacture, or rather growth, of man-made or synthetic quartz. The first experiments in manufacturing or growing synthetic quartz began in 1851, but it was not until the latter part of the twentieth century that the technique was sufficiently perfected for manufactured quartz to be of practical use in electronics. In fact at the time that the tests on the crystal skull were performed at Hewlett-Packard, carefully selected natural quartz was still the main source of crystal for electronic devices, but since then scientists have become so successful at growing their own quartz that synthetic quartz has now all but completely replaced natural quartz as the essential ingredient for most electronic equipment.

      The point about manufactured quartz is that the purity and size of the crystal can be absolutely guaranteed. But this is not to say that the process no longer requires the help of Mother Nature. On the contrary, it is only possible to manufacture quartz СКАЧАТЬ