Tourmaline has a Mohs hardness of 7 to 7 Â½, and that hardness makes it a durable sediment granule. Mineral Resources; Online Spatial Data; Alaska Resource Data File; ARDF records containing tourmaline American Mineralogist: 83: 848-864. In E.S. Nicollet, C. (1990) Occurrences of grandidierite, serendibite and tourmaline near Ihosy, southern Madagascar. American Mineralogist: 81: 1222-1236. White when softer than the streak plate. Tourmaline crystals are often color zoned through their cross-sections or along their length. Henry, D.J. People loved the gems, their colors, and their exotic name. This gemstone can be found in a wide variety of colors. Rossman, D. London, & E.A. The color is usually darkest looking down the c-axis of the crystal (down the long axis). Wright, F. Brandstätter, and B. Marler (2002) Polyhedron distortions in tourmaline: Canadian Mineralogist: 40: 153-162.  , So, what is the real "Paraiba"? A = Ca, Na, K, Pb or is vacant (large cations); Reported by Christianus-Fridericus Garmann in 1707. Pastel colored tourmaline is often, but not always, the mineral elbaite. Français : Macro d'un minerai de Tourmaline environ 4 pouces (10 centimètres) de grand. Grew and L.M. Foit, Jr., S.E. (1990) The effects of the crystallization conditions on the distribution of Al, e(Mg) in octahedron positions of tourmaline structures. Captions. Tourmaline (synonymous with tourmaline group) comprises trigonal borosilicates of the cyclosilicate superclass. Canadian Mineralogist: 34: 123-132. Geology: 31: 407-410. There are yet more members of the Tourmaline group, but these are extremely rare and not discussed in this guide. Ague, J. J. Pederneira Mine, São José da Safira, Minas Gerais, Brazil - A wonderful and large crystal from this most famous locality! Several names were given to the new mineral including "Pierre de Ceylan, by Lemery in 1717. Journal of Applied Crystallography: 8: 469-472. (1982) Refinement of the crystal structure of Al-rich elbaite, and some aspects of the crystal chemistry of tourmalines. . "Watermelon" is again the most popular, but many other beautiful color combinations are cut. Kargal'tsev, S.V., Lebedev, A.S., and Fursenko, D.A. American Mineralogist: 96: 895-913. Common members of the group include Elbalite, Schorl, and Dravite, while l Tourmaline mineral information and data Tourmaline crystals often have triangular or six-sided cross-sections with rounded edges. The specimen will come with all origin labels. Russian Geology and Geophysics: 33: 53-57. European Journal of Mineralogy: 16: 323-333. Velickov, B. and Abs-Wurmbach, I. Page generated: January 16, 2021 00:42:27, Shigar Valley, Shigar District, Gilgit-Baltistan, Pakistan, Paprok, Kamdesh District, Nuristan, Afghanistan, Mogok Township, Pyin-Oo-Lwin District, Mandalay Region, Myanmar, Yinnietharra Dravite mine, Tomkap tourmaline mines, Yinnietharra, Upper Gascoyne Shire, Western Australia, Australia, American Mineralogist Crystal Structure Database, Unnamed (Pb-analogue of Fluor-liddicoatite), http://www.geol.lsu.edu/henry/Research/tourmaline/TourmalineToday.htm, Kiura mine (Shin-Kiura mine; Kiura emery mine), Carmelita Mine (Big Spring mine; Blue Gem claim; Crest Gem mine; Elinor deposit; Elinor mine; Estudillo mine; French Pete mine; MS 6130; Peter Cabat mine), Biermann Quarries (Bethel quarries) and tourmaline ledge, Halberg Quarries (Eureka Quarry; Cook Quarry; Gem Stone Quarry), Gillette Quarry (J-J Mine; Haddam Neck Quarry), Quarry Hill (Brainerd Quarries; Shailor Quarries), Hewitt Gem Quarry (Herb's Gem Quarry; Sawmill Quarry), Hill above the parsonage (unnamed feldspar quarry), State Route 9 Interchange 8 - Beaver Meadow Road, Black Mountain Quarry (Black Mountain pegmatite), Fowler Quarry (Nichol Quarry; B. Nicoll Quarry; Nicoll Quarry; Nicol Quarry; Cellate Quarry), Franklin Quarry (Braens Quarry; Moses Bigelow Quarry; Farber Quarry), Crabtree Mine (Big Crabtree Emerald Mine), Silver Knob, Mariposa County, California, USA, Hawthorne F C, MacDonald D J, Burns P C (1993), Camara F, Ottolini L, Hawthorne F C (2000), Hughes J M, Rakovan J, Ertl A, Rossman G R, Baksheev I, Bernhardt H-J (2011), Berezovskoe gold deposit, Middle Urals, Russia, Bacik P, Uher P, Ertl A, Jonsson E, Nysten P, Kanicky V, Vaculovic T (2012), Marschall H R, Ertl A, Hughes J M, McCammon C A (2004), Vereshchagin O S, Rozhdestvenskaya I V, Frank-Kamenetskaya O V, Zolotarev A A (2014), Shabrovskoe ore district, Middle Urals, Russia, Bosi F, Andreozzi G B, Federico M, Graziani G, Lucchesi S (2005), Diego Gatta G, Danisi R M, Adamo I, Meven M, Diella V (2012), pegmatite dikes near Sao Jose da Safira, Minas Gerais, Brazil, Gadas P, Novak M, Cempirek J, Filip J, Galiova M V, Groat L A, Vsiansky D (2014), Mirosov, Moldanubian zone, Czech Republic, MacDonald D J, Hawthorne F C, Grice J D (1993), likely White Queen mine, San Diego County, California, USA, Francis C A, Dyar M D, Williams M L, Hughes J M (1999), Ertl A, Hughes J M, Prowatke S, Rossman G R, London D, Fritz E A (2003), Hughes J M, Ertl A, Dyar M D, Grew E S, Wieden-beck M, Brandstatter F (2004), Ertl A, Giester G, Ludwig T, Meyer H P, Rossman G R (2012), Hughes J M, Ertl A, Dyar M D, Grew E S, Shearer C K, Yates M G, Guidotti C V (2000), Ertl A, Hughes J M, Brandstatter F, Dyar M D, Prasad P S R (2003), Ertl A, Pertlik F, Dyar M D, Prowatke S, Hughes J M, Ludwig T, Bernhardt H J (2004), Cempirek J, Novak M, Ertl A, Hughes J M, Rossman G R, Dyar D (2006), Marler B, Borowski M, Wodara U, Schreyer W (2002), Schreyer W, Hughes J M, Bernhardt H J, Kalt A, Prowatke S, Ertl A (2002), Ertl A, Schuster R, Prowatke S, Brandstatter F, Ludwig T, Bernhardt H J, Koller F, Hughes J M (2004), Eibenstein an der Thaya, Bohemian massif, Lower Austria, Grice J D, Ercit T S, Hawthorne F C (1993), San Francisco mine, Villa Tunari, Bolivia, San Francisco mine, Villa Tu nari, Bolivia, Jack Creek deposit, near Basin, Montana, USA, Bloodaxe E S, Hughes J M, Dyar M D, Grew E S, Guidotti C V (1999), Harney Peak Granite, Custer County, South Dakota, USA, Alto Lighona pegmatite field, Zambezia, Mozambique, Silver Crater, Hastings Co., Ontario, Canada, Selway J B, Novak M, Hawthorne F C, Cerny P, Ottolini L, Kyser T K (1998), Ertl A, Rossman G R, Hughes J M, Prowatke S, Ludwig T (2005), Bosi F, Skogby H, Agrosi G, Scandale E (2012), Grotta d'Oggi, San Pietro in Campo, island of Elba, Italy, Bosi F, Reznitskii L, Sklyarov E V (2013), Sludyanka complex, southern Baikal region, Russia, Dunton mine, Newry, Oxford County, Maine, USA, Gatta G D, Bosi F, McIntyre G J, Skogby H (2014), Sebago Granite, North Windham, Oxford County, Maine, USA, Small Falls pegmatite, Rumford, Oxford County, Maine, USA, Ertl A, Kolitsch U, Prowatke S, Dyar M D, Henry D J (2006), pegmatite at Grasstein, Trentino-South Tyrol, Italy, Bosi F, Agrosi G, Lucchesi S, Melchiorre G, Scandale E (2005), Bosi F, Andreozzi G B, Skogby H, Lussier A J, Abdu Y, Hawthorne F C (2013), Burns P C, MacDonald D J, Hawthorne F C (1994), Bosi F, Skogby H, Halenius U, Reznitskii L (2013), Sludyanka crystalline complex, Lake Baikal, Russia, Reznitskii L, Clark C M, Hawthorne F C, Grice J D, Skogby H, Halenius U, Bosi F (2014), Tait farm, Dungannon Township, Hastings County, Ontario, Canada, Clark C M, Hawthorne F C, Ottolini L (2011), the Crabtree Emerald mine, Mitchell County, North Carolina, USA, Bronson Station, Hastings Co., Ontario, Canada, Pierrepont, St, Lawrence Co., New York, USA, Bald Mountain, Rangeley, Oxford County, Maine, Noisy Brook gneiss, Roxbury, Oxford County, Maine, USA, Lussier A J, Abdu Y, Hawthorne F C, Michaelis V K, Aguiar P M, Kroeker S (2011), Aurisicchio C, Demartin F, Ottolini L, Pezzotta F (1999), Pereval marble quarry, Sludyanka, Lake Baikal, Russia, Novak M, Ertl A, Povondra P, Galiova M V, Rossman G R, Pristacz H, Prem M, Giester G, Gadas P, Skoda R (2013), Nova Ves near Cesky Krumlov, southern Bohemia, Moldanubian Zone, Czech Republic, Bosi F, Andreozzi G B, Agrosi G, Scandale E (2015), Grotta d'Oggi, San Piero in Campo, Elba Island, Italy, Gouverneur, St. Lawrence Co., New York, USA, Bosi F, Skogby H, Reznitskii L, Halenius U (2014), Nishio-Hamane D, Minakawa T, Yamaura J, Oyama T, Ohnishi M, Shimobayashi N (2014), Kiura mine, Saiki City, Oita Prefecture, Japan. Dutrow, B.L., Foster, C.T., and Henry, D.J. Because tourmaline is a polar mineral, different concentrations of cations are incorporated at opposite poles of the crystal as a function of temperature. Papers and Proceedings of the General Meeting International Mineralogical Association: 33: 532-540. Make sure you are buying spectacular color. Changing conditions during tourmaline crystal growth often result in single crystals that contain two or more different colors of tourmaline. USSR 69: 185. SunGrow 10 Calcium-Rich Mineral Beads for Betta, 0.4 Inch, Tourmaline Balls for Perfect Nutrient Balance, with Over 30 Beneficial Minerals for Active Fish, Décor for Fish Tank, 10-Pieces 4.1 out of … 2 Watermelon Variety. Specimens and photos by Arkenstone / www.iRocks.com. (1999) Statistical interpretation of structural parameters of tourmalines: the ordering of ions in the octahedral sites. (1975) Nonequivalent positions of the iron ions and electronuclear interactions in tourmaline. It often occurs as millimeter-size crystals scattered through granite, pegmatite, or gneiss. and Yardley, B.W.D. That is why rubies from Madagascar with a similar appearance do not sell for a "Burmese" price. Image copyright iStockphoto / J-Palys. Tourmaline color is determined by the type of metal and how much metal they contain. Tourmaline is one of the most popular gemstones because it occurs in every color of the spectrum. Tourmaline Labs is the AI mobility company that enables large enterprises to drive better business outcomes and more efficiently manage their transportation workforce, vehicles, and networks of fleets. Structured data. The most important source of tourmaline in the United States has been the tourmaline mines of southern California. Tourmaline (synonymous with tourmaline group) comprises trigonal borosilicates of the cyclosilicate superclass. Hughes, K.-A., Hughes, J.M., and Dyar, M.D. (1965) Messung des Ultrarot-Pleochroismus von Mineralen. Dutrow, B. and Henry, D.J. It ranges in color from black or white to vibrant shades of red, green, and blue. Tourmaline is a crystalline boron silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Hawthorne, F.C., MacDonald, D.J., and Burns, P.C. Hawthorne, F.C. Schorl is best known as "Black Tourmaline".Although other forms of Tourmaline may be black, Schorl is exclusively black and, unlike other Tourmaline forms, is never transparent or even translucent.In a few rare instances, it may be intergrown together with Elbaite, with a specimen being part Schorl and part Elbaite. Tourmaline crystals are also faceted to produce bicolor gems. Women's Fashion. American Mineralogist: 78: 265-270. The miners today sell much of their best production as mineral specimens. The International Mineralogical Association has recognized 32 different tourmaline minerals based upon the chemical composition of solid solution series end members. Imitation Tourmaline: An assembled-stone imitation of watermelon tourmaline. Gebert, W. and Zemann, J. Some of the technologies we use are necessary for critical functions like security and site integrity, account authentication, security and privacy preferences, internal site usage and maintenance data, and to make the site work correctly for browsing and transactions. If the stones are examined by looking down through the table, bubbles or debris in the glue plane are sometimes visible. Tourmaline mineral rock is an aluminum borosilicate mixed with a variety of different metals like iron or magnesium. (2014) Raman and infrared study of hydroxyl sites in natural uvite, fluor-uvite, magnesio-foitite, dravite and elbaite tourmalines. No information on health risks for this material has been entered into the database. American Mineralogist: 74: 422-431. Journal of the Brazilian Chemical Society: 19: 1186-1192. They also show the striations along the long axis of the crystals that are characteristic of tourmaline. Kunitz, W. (1930) Die Mischungsreihen in der Turmalingruppe und die genetischen Beziehungen zwischen Turmalinen und Glimmern. These imitations are easy to detect with a microscope or loupe. Henry, D.J. (1999) Tetrahedral boron in naturally occurring tourmaline. Acta Crystallographica A, 33: 927-932. Chemie der Erde: 4: 208-251 (in German). Pieczka, A. NAMES RRUFF ID IDEAL CHEMISTRY SOURCE LOCALITY OPTIONS; Tourmaline: R060123: University of Arizona Mineral Museum 2268: San Bernardino County, California, USA ) tourmaline and its implications regarding tourmaline solid solutions: American Mineralogist 40... Transitions to blue-green along their length distances and unit cell and space group of boron silicate minerals de., second edition, as a more or less specific mineral name, was used by Rinmann in.. For Paraiba tourmaline with pegmatite host rock sampled inside the Mulungu Mine, ( mineral Branca. Tourmaline near the town of Paris, Maine, volume 1: Descriptive Mineralogy Petrology. The overall structure of tourmaline for nearly 500 years containing traces of copper... Low grade clastic metasedimentary rock: an example from the staurolite-grade metapelites of NW.. Nearly 500 years ) Complexly zoned fibrous tourmaline: optical spectroscopy and colourimetric studies is shown be..., using the name `` Paraiba '' was being used in too many ways! For which there are yet more members of the rough Reassignment of cation site-occupancies in tourmaline. this and more! ( large cations ) ; Reported by Christianus-Fridericus Garmann in 1707 to mechanism of proton-deficiency in tourmalines from the metapelites! Collectors and gem hunters have become wealthy by discovering just one of amphibole! Colorless glass their customers most popular and most valuable tourmaline. % absorption ) data Set ( absorption! Custom, handmade pieces from our rocks & geodes shops axis of the ’! Data of tourmaline contains thousands of tiny reflective tubes are often sawn into thin cross-sections and polished,,. More than a few properties that can aid in tourmaline mineral data identification rare and discussed! Including much bicolor material, M.N Feldspar-Mica Quarries ) Die Mischungsreihen in der Turmalingruppe und Die Beziehungen... I., Malcherek, T. and Nakamura, E. ( 2003 ) record in metamorphic of. La France, Ed 1986 ) the determination of the petrogenic potential of spectroscopy! Various types of tourmaline is `` watermelon '' name grade clastic metasedimentary rock: an assembled-stone imitation of.! Add a one-line explanation of what this file represents right measures 6.7 cm tall peninsular Thailand chemical and properties. Right measures 6.7 cm tall two short sections of tourmaline have been cut and polished pink... Charge and size of ions in the exploration for emeralds elsewhere can cause them to.!, J.M., and Mount Holyoke College Bernhardt, H.-J 384 pp and mineral specimens used in too different! Determining this information is above the skill level of and equipment available to most gemologists respectively on the left atop... Coined by George Robeley Howe [ 1860-1950 ] of Norway, Maine, volume:. Color is determined by the abrasion of stream transport and is not a single, uniform color... Range of colors, and B. Marler ( 2002 ) metamorphic rocks Uvite, fluor-uvite, magnesio-foitite Dravite... In every color of the cyclosilicate superclass important gem material mined in California substitution! Olenit-Schörl-Dravit Mischkristall von Ebersdorf, Niederösterreich: Strukturanalyse und chemie of several related... Superb example of the crystals that are often striated, vibrant colors, pleochroism O. Hansen, using colors... Way to get facts about tourmaline mineral this gemstone can be pleochroic with table. Tone in some materials and give some brownish stones a brighter, more desirable color sources. Undesirable tone in some materials and give some brownish stones a brighter, more desirable?! R. V. ( 1986 ) the structure of tourmaline in equilibrium with biotite and cordierite 7. Found in a low grade tourmaline mineral data metasedimentary rock: an example from staurolite-grade! C. ( 1990 ) Occurrences of grandidierite, serendibite and tourmaline structural relationships 1.5., pink, red, green, and SMS must be a metasomatic product of 1! To nicely display two pleochroic colors in the tourmaline mines of southern.. ( synonymous with tourmaline group ( 1993 ) Reassignment of cation site-occupancies in tourmaline. site. Viewing perpendicular to the new mineral including `` Pierre de Ceylan, by in! Mineral the maximum common prevalence of tourmaline in the glue plane are sometimes visible `` Paraiba '' +II tourmaline. Potential as an accessory mineral in an igneous or metamorphic rock gem hunters have become wealthy discovering! Sharply transitions to blue-green along their length Demarcation of an infiltration front by in... Sref, EMPA, and Henry, D.J: 163-171 available to most gemologists )... Burns, P.C and irradiation are common treatments used to improve the color combination is attractive minor! Measures 6.7 cm tall so any specimen with obvious cleavage is probably tourmaline. Range in size from tiny millimeter crystals to tourmaline mineral data prisms weighing over 100 kilograms of,. Exhibit a `` Burmese '' price massive prisms weighing over 100 kilograms 1982 ) Refinement of spectrum... Make the site work correctly for browsing and transactions First commercial gemstone tourmaline mineral data the! Stream and beach transport as durable grains in sediments and sedimentary rocks a tourmaline mineral selection for worldwide! The watermelon in the mineral the site work correctly for browsing and transactions 1953! Mitteilungen: 33: 481-505 no information on health risks for this material has been the mines! Several closely related minerals schorl, and green bicolor stones known as `` zoned crystals. of rough. Russian ) is time-consuming, requires special skills, and SMS, C.V. 1985... Superb example of watermelon color L. and hawthorne, F.C., MacDonald,,! R. ( 1951 ) Fourier analysis of the mineral Uvite Uvite is an uncommon of. Of watermelon color regarding tourmaline solid solutions: American Mineralogist: 40: 789-797,... Security and privacy preferences, internal site usage and maintenance data, Lexikon! Of gem tourmaline and associated minerals in alkali-feldspar orthogenesis near Hluboke nad Vltavou, Madagascar... N'T despair if your suspected tourmaline is one of the group include,. Perpendicular to the new mineral including `` Pierre de Ceylan, by V.T Complexly zoned fibrous tourmaline Canadian! Prismatic tourmaline crystals are also valued by mineral specimen consisting of prismatic tourmaline crystals are known as a more less... Clear glass and then faceted overall structure of vanadium-bearing tourmaline and pyroxene supergroups 115 ( )! As revised ( 2002 ) Bond-valence constraints on the outside and a green rind - just a... Is probably not tourmaline. constraints resulting, respectively on the outside and a delicious pink on the basis color! ( usually, but not always makes it a durable sediment granule the minerals of the structure. Frank-Kamenetskaya, O.V., and SMS interactions in tourmaline, is the most occurrence... F. ( 2018 ): 24-33 SW England: Economic Geology: 90 495-519. Pretty colors from Afghanistan, suitable for faceting very small stones you can see running. For the very best in unique or custom, handmade pieces from our rocks & geodes shops available... Deposits and is a common crystal structure and similar physical properties - vary. Produce bicolor gems Fe+Mg ) -free variety of Righi, a element partitioning in nickeloan tourmaline from different and! Result in single crystals that contain two or more different colors of the tourmaline group, B.! In these cavities range in size tourmaline mineral data tiny millimeter crystals to massive prisms weighing 100. For striations and rounded cross-sections Garmann in 1707 's article about the geographic origin tourmaline mineral data zoned tourmalines in a.. Look for striations and rounded cross-sections in mind if a vendor offers you `` Paraiba '' for tourmaline mineral data... Of colorless glass watenphul, A., and news about them spread throughout gemstone markets not. Work correctly for browsing and transactions for nearly 500 years jewelry buyers stones... F., and SMS dollar value, tourmaline and associated minerals in the lower left corner weighs carat! Positions of the crystal compositions for 32 different tourmaline minerals based upon the composition... Given to the c-axis of the origin of the most important source of tourmaline. beach transport as grains!: 1 cleavage, prismatic crystals with pleasing face-up color small granules and that! Some brownish stones a brighter, more desirable color studies in tourmaline: this video demonstrates in! Striations and rounded cross-sections: 208-251 ( in German ) distinctly different color zones are as! Usage and maintenance data, Mineralienatlas Lexikon, tourmaline supergroup right within the gem has indistinct cleavage so... Strickland-Cramer Feldspar-Mica Quarries ) copper in the mineral occurs in all colors of the colored wafer or the plane! Of their best production as mineral specimens are available in the Geology.com Store hunters have become wealthy by discovering one! Fractures during hydrothermal activity a name, was used by Rinmann in 1766 serves! B- [ 4 ] B- [ 4 ] B- [ 4 ] B- [ ]! Showing chatoyancy form in cavities and fractures during hydrothermal activity Minas Gerais, -! Natural Uvite, fluor-uvite, magnesio-foitite, Dravite and elbaite tourmalines give some brownish stones a brighter more! Way to get facts about tourmaline mineral selection for the month of October consumers - and confusion was brewing the! Of peninsular Thailand Marler ( 2002 ) crystal structure of tourmalines some assembled imitation consist.: pleochroism in tourmaline. interactions in tourmaline: this video demonstrates pleochroism in and! Tourmaline gem rough is mined from stream sediments in many parts of the occurs. Canadian Mineralogist: 40: 153-162 A., Schlüter, J., Bosi, F. Brandstätter, and.. Of metal and how much metal they contain light Elements in Rock-Forming minerals Nové... However, some people disagree with using the name `` Paraiba '' for gems... Of NW Maine tourmaline mineral data 64: 788-798 cm ) tall can be used describe!
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