Uvite is an uncommon form of tourmaline, and it forms different crystal formations than the most of the other Tourmalines. Though it lacks the color diversity as some of the other Tourmaline forms, it does occur in beautiful green and reddish-brown crystals, as well as lustrous submetallic crystals. The name Uvite is derived from the Uva Province, in Sri Lanka, where it was first identified.
* Variscite >
Variscite is an opaque gemstone with interesting color splotches and veins. It is usually a light or minty-green with whitish patterns. Almost all Variscite gemstones originate from Utah, and for this reason it may also be called Utahlite. In fact, the most important deposit of gemstone-grade Variscite is actually called the Utahlite Deposit. The only significant deposit of gemstone-grade Variscite is the Utahlite Claim, in the Lucin District, Box Elder County, Utah.
* Zircon >
Zircon is an important gemstone of many colors, and is an historical gemstone used for thousands of years. It is sometimes looked upon as a cheap Diamond, but in actuality it can be a valuable gem. Its color diversity is caused by traces of certain impurities, some of which are radioactive. Zircon gemstones containing radioactive element traces undergo a process called metamiction, in which their inner crystal structure becomes destroyed. These radioactive forms of Zircon must be heated to stabilize them for use as gems. In fact, many of the gem forms of zircon (even those that are not radioactive) are heat treated to enhance color and increase transparency. The radioactivity in Zircon gemstones is very minimal and is generally believed to be safe, without posing any health hazards.Zircon sources include Cambodia, Burma (Myanmar), Sri Lanka (Ceylon), Australia, Tanzania, Mozambique, Madagascar, Nigeria, Pakistan, and Afghanistan.
* Zoisite >
Zoisite is a mineral that includes several gem varieties. The most important and well-known is Tanzanite, a sensational blue gemstone. The variety Thulite is used as a minor pink gemstone. A variety known as Ruby Zoisite, which is green Zoisite associated with opaque red Ruby (and often black amphibole streaks), is used as a carving gemstone as well as a minor gem. The term Zoisite is rarely used on its own in the gemstone trade.
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