![]() Much of this production is sold in the form of geodes, crystal plates, crystals, and tumbled stones. The United States Geological Survey estimated the world’s commercial amethyst production between 20. Some of the amethyst in the Spanish crown jewels may be from this deposit, brought back to Spain by Spanish explorers. The deposit was also known by Native Americans because a few amethyst arrowheads have been found nearby. The mine is well known for producing amethyst with a reddish purple color. Today, the only commercially run amethyst mine in the United States is the Four Peaks Mine in Arizona. Much of it has been as a byproduct of other mining operations. ![]() Other productive amethyst deposits are located in Canada, France, India, Madagascar, Mexico, Morocco, Myanmar, Namibia, Russia, South Africa, Sri Lanka, Tanzania, and the United States.Īmethyst has been produced at many locations in the United States. This is a 10.5 x 8.5 millimeter gem, weighing about 3.15 carats. Four Peaks is the most important amethyst mine in the United States and is famous for producing amethyst with a reddish-purple color. Faceting, cabbing and ornamental grade amethyst can be found in all of these locations however, the amount is usually insufficient to support an ongoing mining operation.Īrizona Amethyst: A beautiful reddish-purple amethyst from the Four Peaks Mine, Maricopa County, Arizona. Small amounts of amethyst are found at many locations throughout the world in igneous, metamorphic, and sedimentary rocks. The name "amethyst" is an incorrect varietal name when used as an adjective for chalcedony. Purple chalcedony and lilac chalcedony, are acceptable names for this material. These materials also have a difference in refractive index. There is where you can observe the luster. If you use a hand lens or a microscope to examine the facet junctions on a faceted stone or the boundary between the flat base of a cabochon and its domed sides, you can usually find at least one tiny conchoidal fracture. Quartz has a vitreous luster on conchoidal fracture faces, while chalcedony has a dull luster on conchoidal fracture faces. The name chalcedony is used for microcrystalline quartz - quartz that is in crystals so small that they cannot be seen without the aid of a microscope.įortunately, it is easy to tell the difference between quartz and chalcedony. Why are those names improper? They are improper because purple quartz (amethyst) and chalcedony are two different gemological materials. It is often improperly called "amethyst" or "amethyst chalcedony." Purple Chalcedony: Chalcedony can occur in a wide range of purple colors. Enormous deposits of amethyst in South America and Africa provide enough amethyst to keep the price low. That makes it durable enough for use in rings, bracelets, earrings, pendants, and any type of jewelry. It is used to produce faceted stones, cabochons, beads, tumbled stones, and many other items for jewelry and ornamental use.Īmethyst has a Mohs hardness of 7 and does not break by cleavage. It is the purple color variety of quartz that has been used in personal adornment for over 2000 years.Īmethyst is the birthstone of February and an important New Age gem. Resources highlighting the new Transitions Signature GEN 8 style colors are available online at /FreeStyle.Amethyst is the world's most popular purple gem. “The vast range of colors creates an opportunity for eyecare professionals to offer their patients an on-trend lens and frame pairing, with the added benefit of indoor and outdoor protection for their eyes.”Īlong with the existing iconic colors of gray, brown and graphite green, the four style colors also block 100% of UV and help protect from harmful blue light indoors and out. “The addition of the four style colors to the innovative Transitions Signature GEN 8 lens portfolio is a true intersection of fashion and technology, boosting the style factor for glasses through lenses,” said Elise Bioche, vice president, global marketing, Transitions Optical. The new Amber lens has a good balance between darkness and color intensity with more honey/yellow colored tones. The hues of the new style colors are also comparable to the existing color hues, with the exception of Amber. They have faster activation and faster fadeback than Transitions Signature VII, are fully clear indoors, and have consistent tint across all activation states. The Transitions Signature GEN 8 lenses in style colors have the best performance ever on style colors. The suite of vibrant style colors creates a unique opportunity for your patients to upgrade their style with an on-trend pairing of frames and lenses. (PRESS RELEASE) PINELLAS PARK, FL – The Transitions Signature lenses style color collection – Amber, Amethyst, Emerald and Sapphire – are now available in GEN 8 breakthrough photochromic lens technology.
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