Gold found in the ground will generally have a polycrystalline structure, meaning it is made up of many crystallites, varying in shape and size. Gold of a mono-crystalline structure, where the material is unbroken, are rarer and of significantly higher value. The US-based owner provided geologist John Rakovon with four gold specimens, hoping to determine whether they were of a polycrystalline or mono-crystalline structure.
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The specimen, the largest single crystal piece of gold in the world, was discovered in Venezuela decades ago, but it is only by using advanced probing instruments that experts can now verify its authenticity.
Using a single-crystal diffraction (SCD) tool and a high-pressure/preferred orientation (HIPPO) instrument at the Los Alamos National Laboratory, Rakovan was able to examine the minerals using a technique called neutron diffractometry. As opposed to other probes, such as x-rays or electrons, neutrons allow the scientists to peer deep inside the materials and evaluate their structure.
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