Dravite forms multiple series, with other tourmaline members, including schorl and elbaite. [18] It is not clear when the first tourmaline was found in California. C $534.18 . Any blue tourmaline that is diamagnetic can be identified as paraiba tourmaline colored by copper in contrast to magnetic blue tourmaline colored by iron. 5 out of 5 stars (1,289) 1,289 reviews $ 25.99. Some placer material suitable for gem use comes from Sri Lanka and India. [10][11][12], Tourmaline is a six-member ring cyclosilicate having a trigonal crystal system. While rare, other species occasionally show up as gems as well. ", http://dsalsrv02.uchicago.edu/cgi-bin/philologic/search3advanced?dbname=tamillex&query=Tourmaline&matchtype=exact&display=utf8, "Classification of the minerals of the tourmaline group", "Nomenclature of the tourmaline-supergroup minerals", "A zircon-tourmaline-rutile maturity index and the interdependence of the composition of heavy mineral assemblages with the gross composition and texture of sandstones", 10.1306/74D70CE5-2B21-11D7-8648000102C1865D, "Tourmaline: The gemstone Tourmaline information and pictures", "Investigations on Olenite with Excess Boron from the Koralpe, Styria, Austria", "About the Etymology and the Type Localities of Schorl", "About the Type Locality and the Nomenclature of Dravite", "About the Nomenclature and the Type Locality of Elbaite: A Historical Review", "Role of Natural Radiation in Tourmaline Coloration", "Origin of Color in Cuprian Elbaite from São José de Batalha, Paraíba, Brazil", Tourmaline Characteristics and Geological data, https://en.wikipedia.org/w/index.php?title=Tourmaline&oldid=980378572, Short description is different from Wikidata, Articles with unsourced statements from September 2018, Creative Commons Attribution-ShareAlike License, Most commonly black, but can range from colorless to brown, red, orange, yellow, green, blue, violet, pink, or hues in between; can be bi-colored, or even tri-colored; rarely can be neon green or electric blue. [14], Some tourmaline gems, especially pink to red colored stones, are altered by heat treatment to improve their color. The first documented case was in 1890 when Charles Russel Orcutt found pink tourmaline at what later became the Stewart Mine at Pala, San Diego County. 0 bids. [23], Another highly valuable variety is chrome tourmaline, a rare type of dravite tourmaline from Tanzania. There are 30 tourmaline noire for sale on Etsy, and they cost US$126.26 on average. KIPOZI Pro Nano Titanium Flat Iron Hair Straightener with Digital LCD Display, Heats Up Instantly, A High Heat of … Brightly colored Ceylonese gem tourmalines were brought to Europe in great quantities by the Dutch East India Company to satisfy a demand for curiosities and gems. Find out more in our Cookies & Similar Technologies Policy. 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