![]() Amethyst also forms the internal lining of geodes, some of which can be over 10 feet tall and weighing several tons.įor additional information, see the gemstone section on Amethyst. Some varieties may also change to a light green color, which is given the trade name "Prasiolite", or "Green Amethyst", as it is more commonly known in the gem trade.Īmethyst is most prevalent as small stubby pyramidal crystals, although several localities such as the Mexican occurrences are well-known for producing elegantly tall prismatic crystals, which are very highly regarded by collectors. When used as a gemstone, Amethyst is often heat treated to deepen the color, or to transform it into Citrine. The color of some Amethyst specimens from certain localities slowly fade upon prolonged exposure to light. Its name derives from the Greek "amethystos", which means "not drunken", as Amethyst in antiquity was thought to ward off drunkenness. It is the purple variety of the mineral Quartz, and its most valuable and prized variety. Many areas in the jewelry industry-education, gemological research, lecturing, publication, and laboratory and inventory documentation, to name a few-either require or benefit from high-quality photomicrography.Amethyst is a well known mineral and gemstone. Just because you don’t see it, doesn’t mean it isn’t there. Opal with Fluid Inclusion and Mobile BubbleĪ Mexican opal was recently examined at the GIA laboratory in Carlsbad.Īlthough opals generally contain water in their structure, fluid inclusions large enough to be resolved with the microscope are rare those that can be seen with the unaided eye are exceedingly rare.Ī guide to capturing gem inclusion scenes using practical equipment and techniques and the appropriate image-refining software. This fascinating purple fluid inclusion is one of the strangest and most interesting the authors have examined.Ī blue topaz recently examined by the authors contained an interesting and complex fluid-filled negative crystal that revealed some remarkable behavior when cooled down. However, the possibility of such artificial tampering cannot be ruled out entirely. While the composition of the fluid is unknown, as well as the conditions under which the fluid entered the quartz, there is no obvious indication that it resulted from an artificial process. Unfortunately, Raman spectroscopy to identify the fluid was unsuccessful, as the fluid was too deep in the crystal. 71)-this is the authors’ first observation of a purple fluid trapped within quartz. ![]() 79–81 Spring 2006 Gem News International, p. While colored fluid inclusions have been previously reported in quartz-colors that include blue, yellow, and orange (see e.g., Spring 2004 Gem News International, pp. This suggests that the purple fluid may have entered the negative crystal cavities through a post-growth or secondary process rather than homogeneous entrapment during growth. However, all of the purple liquid–hosting negative crystals did contain partially healed, limonite-stained fractures intersecting them. Not all of the fluid inclusions within this quartz contained the purple component. Photomicrograph by Nathan Renfro field of view 14.50 mm. ![]() Several fluid-filled negative crystals were present in this rock crystal quartz cabochon, a few of which contained a highly unusual brightly colored purple liquid. Comprehensive CAD/CAM For Jewelry Certificateįigure 2. ![]()
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