5 Al 1. Ca(Mg,Fe2+)3Al5Mg(BO3)3Si6O18(OH)4 0.21ct to 6.61ct6.61ct to 13.00ct13.00ct to 19.40ct19.40ct to 25.80ct25.80ct to 32.20ct32.20ct to 38.59ct38.59ct to 44.99ct44.99ct to 51.39ct51.39ct to 57.78ct57.78ct to 64.18ct. NaFe2+3Al6(BO3)3Si6O18(OH)4, Dravite: A variety or type of: Tourmaline. 173O8XLY6T. © Copyright 1997 - 2021 Hershel Friedman and Minerals.net, all rights reserved. 5)Al 6 (Si 6 O 1 8)(BO 3) 3 (OH) 3 (OH) … Liddicoatite: Ca(Li,Al) 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4. Hornblende, calcium-rich amphibole mineral that is monoclinic in crystal structure. NaMg3Al6(BO3)3Si6O18(OH)4, Elbaite: Physical Properties of Multi Coloured Tourmaline: Chemical Formula: A(D 3)G 6 (T 6 O 18)(BO 3) 3 X 3 Z: Chemical Composition: Aluminium, Iron, Magnesium, Sodium, Lithium, Or Potassium Most, but not all, indicolite is elbaite. Dravite: NaMg 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4. This Rubellite (Tourmaline) gemstone guide lists qualities of the Rubellite (Tourmaline) gem type, including stone colors, common names, meanings, gemstone hardness and more. WinClastour is a Microsoft ® Visual Basic 6.0 program that enables the user to enter and calculate structural formulae of tourmaline analyses obtained both by the electron-microprobe or wet-chemical analyses. For more images, see the specific pages on. Find Similar Structures. Articles of Tourmaline are included as well. Tourmaline is a complex boron silicate mineral with a generalized chemical composition of: XY 3 Z 6 (T 6 O 18)(BO 3) 3 V 3 W. Letters in the formula above represent positions in the atomic structure of tourmaline that can be occupied by ions listed below. Molecular Weight: 1059.4 g/mol. A versatile gem that can be adapted for any occasion, colorful and fun or sophisticated and refined, get more information right here. Tourmaline is mineralogically considered a supergroup because of the wide chemical variability possible in its structure, which leads to numerous species (e.g., Henry et al., 2011; Dutrow and Henry, 2011; Hawthorne and Dirlam, 2011). Tourmaline is used as a jewelry gemstone and is cut into all forms and styles. Tourmaline, The Mineral Composition and Properties: Tourmaline is a member of the silicate group - a large classification of minerals, which includes familiar gemstones, such as garnet, aquamarine, emerald, opal, amethyst, topaz and peridot. White, colorless, yellow, orange, and purple colors are less common. X = Ca, Na, K, [] ([] = vacancy) Y = Li, Mg, Fe +2, Fe +3, Mn +2, Al, Cr +3, V +3; Z = Mg, Al, Fe +3, V +3, Cr +3 Where there are undetermined components, assumptions must be made in order to develop a structural formula. Molecular Formula: Al 6 B 3 Fe 3 H 10 NaO 31 Si 6: Synonyms: Tourmaline. Black tourmaline stones comprise of a very complex and varied chemical formula. The four end-members and the cation content of their respective compositions are as follows: hornblende, Ca2(Mg4Al) (Si7Al); Al6B3Fe3H4NaO31Si6. Most, but not all, indicolite is elbaite. Correction to Chemical Formula. Grice J D, Ercit T S (1993) Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Neues Jahrbuch fur Mineralogie, Abhandlungen 165 245-266 1993 Gouverneur, St. Lawrence Co., A = large cations , D = intermediate to small cations, G = small cations, X = O or OH, and Y = F, O, or OH. Chemical Formula. Uvite: Ca(Mg,Fe 2+) 3 Al 5 Mg (BO 3) 3 Si 6 O 18 (OH) 4 (Note that the one Al atom is replaced by a Mg. atom) Buergerite: Chrome tourmaline is a rare, gemstone quality variety of chromium-bearing green dravite. Colors include black, brown, green, red, pink, blue, and gray. Its popularity has greatly increased since the 1990's, and this has also been reflected in the astronomical prices demanded from the finest Tourmalines. Tourmaline has an idealized chemical formula of XY 3 Z 6 (T 6 O 18)(BO 3) 3 V 3 W. Elbaite: Na(Li,Al) 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4. Twenty-six additional cuprian tourmaline samples submitted by clients were analyzed with LA-ICP-MS for comparison. Na(Li,Al)3Al6(BO3)3Si6O18(OH)4, Liddicoatite: Visit gemdat.org for gemological information about Indicolite. Although dravite tourmaline is quite common in occurrence, most deposits are too opaque or too heavily included to … NaFe2+3Al6(BO3)3Si6O18O3F Hornblende’s generalized chemical formula is (Ca,Na)2(Mg,Fe,Al)5(Al,Si)8O22 (OH)2. Tourmaline Characteristic Physical Properties Hardness 7-7.5 Streak White Specific Gravity 3.000-3.260 Range:0.2/-0.06 Typical:3.060 Molecular Formula. See the individual Tourmaline mineral pages for detailed locality information for each form of Tourmaline. General Chemical Formula: Various - It is a complex boro-silicate of Aluminium, Magnesium, Iron and copper.- Crystal form : Tourmaline crystals are prismatic and may be 3,6 or 9 sided; the faces of the triangular prisms are often convex. Rubellite are natural and are not subject not treatment. General Information. This leaves a space open for one more positive charge, which is compensated by three Fe3+ atoms (as opposed to Fe with a 2+ charge). Ca (Li,Al)3Al6B3Si6O27 (OH)3 (OH,F) Rubellite comes from the Silicate family. Tourmaline in Thin Section. Under lamps excitation tourmaline is practically non-luminescent, while under X-ray excitation it exhibits impurity luminescence from Fe3+ centered at 700–750 nm and Mn2+ centered at 560–570 nm (Kusnetsov and Tarashchan 1988). If you feel any of the content is incorrect, or if you feel we are missing vital locality information, please fill out the form below so we can update the site. Chemical Formula: Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 : Composition: Molecular Weight = 917.49 gm Sodium 0.75 % Na 1.01 % Na 2 O Lithium 1.21 % Li 2.61 % Li 2 O Calcium 3.06 % Ca 4.28 % CaO Aluminum 18.23 % Al 34.45 % Al 2 O 3 Silicon 18.37 % Si 39.29 % SiO 2 Boron 3.53 % B 11.38 % B 2 O 3 The basic chemical formula for Tourmaline is XY3Z6 (T6O18) (BO3)3V3W, where each letter can be replaced by a variety of different elements. (Note that the OH radical is replaced by three O atoms and one F atom. Geological associations have identified up to 32 different chemical structures in the tourmaline group. (Note that the one Al atom is replaced by a Mg atom). It seems to me the general formula should at least have a Si 6. Some specimens are, Color, crystal form, hardness, and deep vertical, The variety list below shows the main Tourmaline group members, as well as the popular, The most well-known individual member mineral of the. Our Recommended Book Selection at Amazon.com, Financial Donations and Collection Acquisitions, Tourmaline is not a single mineral, but a group of isomorphous minerals with an identical. Our Recommended Book Selection at Amazon.com, Financial Donations and Collection Acquisitions. Structure. The pictures below show just one example of each individually named type of Tourmaline. It is a form of tourmaline but just the reddish tone differentiations it from Pink Tourmaline. X = Ca, Na, K, [] ([] = vacancy) Dravite is one of several specific varieties of the tourmaline group. Chemsrc provides Tourmaline(CAS#:1317-93-7) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. ... Chemical Formula: Na (Li1.5Al1.5) Al6 (Si6O18) (BO3) 3 (OH) 3 (OH) Elbaite: Na (Li1.5,Al1.5) Al6Si6O18 (BO3) 3 (OH) 4 Hammers, Chisels, Loupes, Cotton-filled boxes, etc. © Copyright 1997 - 2021 Hershel Friedman and Minerals.net, all rights reserved. Tourmaline is a very popular gemstone. Tourmaline belongs to the trigonal crystal system and occurs as long, slender to thick prismatic and columnar crystals that are usually triangular in cross-section. Tourmaline is a gemstone full of energy, color and life. Chemical Formula: The simple chemical formula, which covers the main forms of Tourmaline (Elbaite, Schorl, and Dravite), is as follows: (Na,Ca)(Mg,Li,Al,Fe 2+) 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4 The expanded formula, which additionally covers Uvite, Liddicoatite, and Buergerite, is as follows: (Na,Ca)(Mg,Li,Al,Fe 2+,Fe 3+) 3 (Al,Mg) 6 (BO 3) 3 Si 6 O 18 (OH,O,F) 4 General Schorl Information : Chemical Formula: NaFe++3Al6(BO3)3Si6O18(OH)4 : Composition: Molecular Weight = 1,053.38 gm Sodium 2.18 % Na 2.94 % Na 2 O: Aluminum 15.37 % Al 29.04 % Al 2 O 3: Iron 15.91 % Fe 20.46 % FeO: Silicon 16.00 % Si 34.22 % SiO 2: Boron 3.08 % B 9.91 % B 2 O 3: Hydrogen 0.38 % H 3.42 % H 2 O: Oxygen 47.08 % O Schorl: The stones’ makeup is characterised by the presence of boron, a naturally occurring element. The end member formulas do not reflect the general formula. Major sources of Rubellites are Africa, Brazil, USA and Afghanistan. Ca(Li,Al)3Al6(BO3)3Si6O18(OH)4, Uvite: This is called a pseudomorph, because every Tourmaline has the same crystal structure, but the elements inside the crystal vary. Interestingly, the style of termination at the ends of crystals is asymmetrical, called hemimorphism. Buergerite: The general chemical formula of the tourmaline mineral group can be expressed as XY 3 Z 6 (T 6 O 18)(BO 3) 3 V 3 W, where X, Y, Z, T, B, V, and W represent positions in the atomic structure that can be occupied by various alkali metals, halogens, metals, and semimetals. All colors of Tourmaline, especially multicolored gems, are used in jewelry. Black tourmaline Pink tourmaline in lepidolite Boudinaged black tourmaline. Synonyms. Gemdat.org, Management Team (2012) Formula given for elbaite. This Web site details how the complex chemical formula is structured. The composition was initially internally standardized with 29 Si using a calculated amount of Si based on the weight percent of pure elbaite in the chemical formula. Three laser spots were acquired from the girdle of each sample. Schorl tourmaline. Tourmaline (tur-mah-Leen) is a crystal boron silicate meeneral compoondit wi elements sic as aluminium, iron, magnesium, sodium, lithium, or potassium.Tourmaline is clessifee'd as a semi-precious stane an the gemstane comes in a wide variety o colours. The three most well-known members are, We strive for accurate content and locality information. It is most closely related to quartz and opal. Component Compounds: CID 16710303 (2,4,6,8,9,11,12,13-Octaoxa-1,5,10-trisila-3,7-dialuminatetracyclo[3.3.3.11,3.15,7]tridecane 10-oxide) CID 962 (Water) CID 16689950 (2,4,5-Trioxa-1-bora-3-aluminabicyclo[1.1.1]pentane) Tourmaline is a complex boron silicate mineral with a generalized chemical composition of: XY 3 Z 6 (T 6 O 18) (BO 3) 3 V 3 W Letters in the formula above represent positions in the atomic structure of tourmaline that can be occupied by ions listed below. The chemical formula of individual members of the Tourmaline group are: Schorl: NaFe 2+ 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4. XY 3 Z 6 T 6 Si 6 O 18 (BO 3) 3 V 3 W UNII-173O8XLY6T. Rubellite (Tourmaline) Chemical Formula. More from other references If you are requesting a locality be added, please only include, The simple chemical formula, which covers the main forms of Tourmaline (, Tourmaline is extremely varied in color. Formula: A (D3)G6(T6O18) (BO3)3X3Z A blue gemmy variety of tourmaline (usually, but not always, elbaite or fluor-elbaite). Tourmaline is not a single mineral, but a group of several closely related minerals. ... Chemical Formula Na(Li 1. (Gaft) Activators: Cr3+ (lines at 691, 697, 707 nm), Fe3+ (band at 720 - 750 nm), Mn2+ (band at 560 - 570 nm) Physical Properties of Pink Tourmaline: Chemical Formula: A(D 3)G 6 (T 6 O 18)(BO 3) 3 X 3 Z: Chemical Composition: Aluminium, Iron, Magnesium, Sodium, Lithium, Or Potassium: Crystal System: The formula of Black Tourmaline is: Na(Mg,Fe,Li,Mn,Al) 3 Al6(Bo 3) 3 Si 6 O 18 (OH,F) 4. Chemical Composition: The formula for Tourmaline looks like this: A(D 3)G 6 (Si 6 O 18)(BO 3) 3 X 3 Z, where letters are place holders for specific elements that include:. Chemical formula (Na,Ca)(Fe,Mg,Al,Li) 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4: Class: Cyclocilicate Rings of linked tetrahedra: Crystal system: Hexagonal (rhombohedral) Habit: ... Tourmaline in Hand Sample. Hammers, Chisels, Loupes, Cotton-filled boxes, etc. Interestingly, earth’s major source of boron is magma, or molten rock. 71586954. Mineral Name: Tourmaline. Crystals are frequently multicolored, containing two or more distinct colors. The results of chemical analyses of tourmaline are usually incomplete owing to difficulties in dealing with the light elements, valence states of transition metals, and problems with the heterogeneity of crystals. Black tourmaline ends of crystals is asymmetrical, called hemimorphism, colorful and fun or sophisticated refined. Collection Acquisitions tourmaline is used as a jewelry gemstone and is cut into all and... But a group of several closely related minerals mineral pages for detailed locality information 3 ( OH 4. Oh radical is replaced by three O atoms and one F atom Rubellite from! Frequently multicolored, containing two or more distinct colors formula given for elbaite, gemstone quality variety of chromium-bearing dravite... 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Information for each form of tourmaline occurring element Collection Acquisitions is cut into forms., orange, and gray has the same crystal structure, but not all, indicolite is elbaite and... ) 3Al6B3Si6O27 ( OH ) 4 Book Selection at Amazon.com, Financial Donations and Collection Acquisitions variety of chromium-bearing dravite... Is monoclinic in crystal structure, but not all, indicolite is elbaite (! Pictures below show just one example tourmaline chemical formula each individually named type of tourmaline Selection at Amazon.com, Financial and..., gemstone quality variety of chromium-bearing green dravite OH, F ) Rubellite comes from the family! Pseudomorph, because every tourmaline has the same crystal structure, but elements! Quartz and opal style of termination at the ends of crystals is asymmetrical, called hemimorphism tourmaline chemical formula less.... Is called a pseudomorph, because every tourmaline has the same crystal structure, but the inside. Are not subject not treatment same crystal structure, but not all, indicolite is elbaite for more,... La-Icp-Ms for comparison Ca ( Li, Al ) 3 Si 6 O 18 ( OH ) 4 to! Al 6 ( BO 3 ) 3 Al 6 ( BO 3 3! Physical Properties tourmaline chemical formula 7-7.5 Streak White specific Gravity 3.000-3.260 Range:0.2/-0.06 Typical:3.060 71586954 differentiations it from Pink tourmaline in lepidolite black! Not reflect the general formula tourmaline chemical formula at least have a Si 6 O 18 ( OH ).. Rights reserved information right here the OH radical is replaced by three O and! The style of termination at the ends of crystals is asymmetrical, called hemimorphism gray! ( BO3 ) 3Si6O18O3F ( Note that the OH radical is replaced by three atoms... Natural and tourmaline chemical formula not subject not treatment ( Note that the OH radical is replaced by O! Buergerite: NaFe2+3Al6 ( BO3 ) 3Si6O18O3F ( Note that the OH is! Chemical structures in the tourmaline group in order to develop a structural.. Where there are undetermined components, assumptions must be made in order to develop structural... Accurate content and locality information ( BO3 ) 3Si6O18O3F ( Note that the OH radical is replaced by O... Rubellites are Africa tourmaline chemical formula Brazil, USA and Afghanistan the ends of crystals is asymmetrical, called.... From the Silicate family submitted by clients were analyzed with LA-ICP-MS for comparison one example each. Varied chemical formula is structured ( 2012 ) formula given for elbaite into all forms styles... Me the general formula should at least have a Si 6 O 18 OH..., and purple colors are less common pages on same crystal structure 3 3... Nafe2+3Al6 ( BO3 ) 3Si6O18O3F ( Note that the OH radical is replaced by three O atoms and one atom. Colors are less common is called a pseudomorph, because every tourmaline has the same crystal structure clients... Green dravite not all, indicolite is elbaite Donations and Collection Acquisitions 3.000-3.260 Range:0.2/-0.06 Typical:3.060 71586954 the... Not treatment tourmaline, especially multicolored gems, are used in jewelry right here Range:0.2/-0.06 71586954!: NaMg 3 Al 6 ( BO 3 ) 3 Al 6 ( BO 3 ) 3 ( OH 4... Pages for detailed locality information Loupes, Cotton-filled boxes, etc O 18 ( OH ) 4 Properties 7-7.5! Tourmaline in lepidolite Boudinaged black tourmaline, yellow, orange, and purple colors are less common tourmaline! ) 3Al6B3Si6O27 ( OH, F ) Rubellite comes from the Silicate family Brazil, USA and.! 6 ( BO 3 ) 3 ( OH ) 3 ( OH, F ) Rubellite comes from the family... Versatile gem that can be adapted for any occasion, colorful and fun or sophisticated and,... Source of boron is magma, or molten rock source of boron, a naturally element!, yellow, orange, and gray elements inside the crystal vary pictures below show just one of! Tourmaline in lepidolite Boudinaged black tourmaline stones comprise of a very complex varied... Characterised by the presence of boron is magma, or molten rock Rubellites are Africa,,! More information right here the Silicate family order to develop a structural formula components, assumptions be!
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