English speaking customer support only. GemSelect's Telephone numbers. Update Translation. X Close Window. Size and Weight. Gems are always measured in Millimeter mm Dimensions are given as; length x width x depth , except for round stones which are; diameter x depth Select gems by size, not by weight! Amethyst Geode Important deposits of amethyst are also found in North America.
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This gemstone was historically reserved for royalty, but today it is used in a variety of beautiful jewelry. Amethyst can be naturally mined as well as lab created, both of which make great additions to rings, necklaces, bracelets, and more. Amethyst is the birthstone for the month of February, as well as the traditional gift for six-year anniversaries. View Amethyst Catalog. Until the 19th century, amethyst was primarily mined in Russia. However supply dramatically increased when natural sources of its crystals were discovered in Brazil.
Today, amethyst can be found all over the world, from Africa to Asia, to South America. Brazil remains a major supplier, with a large portion of the stones coming from the southern state of Rio Grande du Sol. Amethyst is a variety of quartz and its chemical makeup is composed of silicon dioxide. Quartz is formed in lava, specifically when gas bubbles become trapped, allowing crystals to form inside the cavities created by the bubbles.
When the cavities are filled with a silica-rich liquid, crystals begin to form within volcanic rocks. That is a pretty nifty trick! That covers the basics of these seemingly ordinary but surprisingly extraordinary crystals. Next, we'll visit an ancient Egyptian amethyst quarry that supplied generations of Egyptians and Romans with gorgeous purple gems, and then we'll travel to South America to learn how those extra huge geodes happen.
World Journal of Nuclear Science and Technology, vol. Dennen, William H. Canadian Mineralologist VoL 11, pp. Voudouris, P. Bulletin of the Geological Society of Greece, 47 1 , Minerals 8, no. The views expressed are those of the author s and are not necessarily those of Scientific American.
A confirmed adorer of the good science of rock-breaking, Dana Hunter explores geology with an emphasis on volcanic processes, geology news, and the intersection of science and society. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue. See Subscription Options. Go Paperless with Digital. Amethyst , the violet variety of the mineral quartz, is the gemstone coupled to the month of February.
Every species of quartz, and there are several, posses similar crystal formations and physical properties, but differ in chemical composition.
The gemstone amethyst is a purple tinted quartz and owes its color to irradiation and trace elements of iron in its crystal structure. Amethyst can occur in hues from light pinkish violet to deep purple, but the finest color of amethyst is considered a strong reddish medium toned purple. Amethyst can be found in large geodes within sedimentary and volcanic rock.
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