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Tanzanite is a pleochroic gemstone. Most Tanzanite are blue when viewed from one direction but can vary from violet to red when seeing from a different angle. The physical characters can make cutting process difficult due to the problem of selecting the perfect color.
TanzaniteOne Mining Ltd was founded by Richland Resources, a gemstone development and mining company who were listed on the London Stock Exchanges AIM market (AIM:RLD) in 1994 . In 2014 TanzaniteOne was sold to a private company, Sky Associates , who are now the current owners.
Zoisite may be blue to violet, green, brown, pink, yellow, gray, or colorless. Blue crystals are known under the name tanzanite. It has a vitreous luster and a conchoidal to uneven fracture. When euhedral, zoisite crystals are striated parallel to the principal axis (c-axis). Also parallel to the principal axis is one direction of perfect cleavage.
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 v
The following values may be used for the importance parameter: Top (adds articles to Category:Top-importance Gemology and Jewelry articles); High (adds articles to Category:High-importance Gemology and Jewelry articles)
Nine people are dead, including five juveniles, after a driver crashed into a canal Monday night in western Palm Beach County, officials said.
The carat (ct) is a unit of mass equal to 200 mg (0.00705 oz; 0.00643 ozt), which is used for measuring gemstones and pearls. The current definition, sometimes known as the metric carat , was adopted in 1907 at the Fourth General Conference on Weights and Measures , [ 1 ] [ 2 ] and soon afterwards in many countries around the world.
A gemstone (also called a fine gem, jewel, precious stone, semiprecious stone, or simply gem) is a piece of mineral crystal which, when cut or polished, is used to make jewelry or other adornments.