General Information. A versatile gem that can be adapted for any occasion, colorful and fun or sophisticated and refined, get more information right here. 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. 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. It seems to me the general formula should at least have a Si 6. Buergerite: It is a form of tourmaline but just the reddish tone differentiations it from Pink Tourmaline. 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. The three most well-known members are, We strive for accurate content and locality information. The formula of Black Tourmaline is: Na(Mg,Fe,Li,Mn,Al) 3 Al6(Bo 3) 3 Si 6 O 18 (OH,F) 4. Gemdat.org, Management Team (2012) Formula given for elbaite. This Web site details how the complex chemical formula is structured. Mineral Name: Tourmaline. Our Recommended Book Selection at Amazon.com, Financial Donations and Collection Acquisitions. Chemical Formula. 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 NaFe2+3Al6(BO3)3Si6O18(OH)4, Dravite: Hornblende, calcium-rich amphibole mineral that is monoclinic in crystal structure. Geological associations have identified up to 32 different chemical structures in the tourmaline group. Rubellite (Tourmaline) Chemical Formula. 173O8XLY6T. © Copyright 1997 - 2021 Hershel Friedman and Minerals.net, all rights reserved. (Note that the one Al atom is replaced by a Mg atom). Its popularity has greatly increased since the 1990's, and this has also been reflected in the astronomical prices demanded from the finest Tourmalines. Most, but not all, indicolite is elbaite. Synonyms. 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. 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 NaFe2+3Al6(BO3)3Si6O18O3F Find Similar Structures. X = Ca, Na, K, [] ([] = vacancy) 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: 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. A = large cations , D = intermediate to small cations, G = small cations, X = O or OH, and Y = F, O, or OH. 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: Interestingly, the style of termination at the ends of crystals is asymmetrical, called hemimorphism. White, colorless, yellow, orange, and purple colors are less common. Chemsrc provides Tourmaline(CAS#:1317-93-7) MSDS, density, melting point, boiling point, structure, formula, molecular weight etc. 71586954. The stones’ makeup is characterised by the presence of boron, a naturally occurring element. 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). 5)Al 6 (Si 6 O 1 8)(BO 3) 3 (OH) 3 (OH) … It is most closely related to quartz and opal. The pictures below show just one example of each individually named type of Tourmaline. 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. Crystals are frequently multicolored, containing two or more distinct colors. 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 Hammers, Chisels, Loupes, Cotton-filled boxes, etc. 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. (Note that the OH radical is replaced by three O atoms and one F atom. Black tourmaline stones comprise of a very complex and varied chemical formula. Structure. © Copyright 1997 - 2021 Hershel Friedman and Minerals.net, all rights reserved. For more images, see the specific pages on. Dravite: NaMg 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4. Schorl tourmaline. Dravite is one of several specific varieties of the tourmaline group. Although dravite tourmaline is quite common in occurrence, most deposits are too opaque or too heavily included to … 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 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. Ca(Li,Al)3Al6(BO3)3Si6O18(OH)4, Uvite: 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. 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 Al6B3Fe3H4NaO31Si6. Three laser spots were acquired from the girdle of each sample. Articles of Tourmaline are included as well. (Gaft) Activators: Cr3+ (lines at 691, 697, 707 nm), Fe3+ (band at 720 - 750 nm), Mn2+ (band at 560 - 570 nm) 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., 5 Al 1. Schorl: All colors of Tourmaline, especially multicolored gems, are used in jewelry. See the individual Tourmaline mineral pages for detailed locality information for each form of Tourmaline. Chrome tourmaline is a rare, gemstone quality variety of chromium-bearing green dravite. Tourmaline is a very popular gemstone. Major sources of Rubellites are Africa, Brazil, USA and Afghanistan. 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. Tourmaline in Thin Section. Tourmaline is used as a jewelry gemstone and is cut into all forms and styles. The end member formulas do not reflect the general formula. 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 A variety or type of: Tourmaline. The four end-members and the cation content of their respective compositions are as follows: hornblende, Ca2(Mg4Al) (Si7Al); 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. Tourmaline Characteristic Physical Properties Hardness 7-7.5 Streak White Specific Gravity 3.000-3.260 Range:0.2/-0.06 Typical:3.060 Colors include black, brown, green, red, pink, blue, and gray. Rubellite are natural and are not subject not treatment. Na(Li,Al)3Al6(BO3)3Si6O18(OH)4, Liddicoatite: 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:. 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. Visit gemdat.org for gemological information about Indicolite. 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). Where there are undetermined components, assumptions must be made in order to develop a structural formula. Most, but not all, indicolite is elbaite. 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) 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. 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). Molecular Formula. 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. Molecular Formula: Al 6 B 3 Fe 3 H 10 NaO 31 Si 6: Synonyms: Tourmaline. Tourmaline is not a single mineral, but a group of several closely related minerals. This Rubellite (Tourmaline) gemstone guide lists qualities of the Rubellite (Tourmaline) gem type, including stone colors, common names, meanings, gemstone hardness and more. Hornblende’s generalized chemical formula is (Ca,Na)2(Mg,Fe,Al)5(Al,Si)8O22 (OH)2. This is called a pseudomorph, because every Tourmaline has the same crystal structure, but the elements inside the crystal vary. NaMg3Al6(BO3)3Si6O18(OH)4, Elbaite: Ca(Mg,Fe2+)3Al5Mg(BO3)3Si6O18(OH)4 XY 3 Z 6 T 6 Si 6 O 18 (BO 3) 3 V 3 W Tourmaline is a gemstone full of energy, color and life. 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. Liddicoatite: Ca(Li,Al) 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4. Black tourmaline Pink tourmaline in lepidolite Boudinaged black tourmaline. Ca (Li,Al)3Al6B3Si6O27 (OH)3 (OH,F) Rubellite comes from the Silicate family. UNII-173O8XLY6T. Elbaite: Na(Li,Al) 3 Al 6 (BO 3) 3 Si 6 O 18 (OH) 4. Formula: A (D3)G6(T6O18) (BO3)3X3Z A blue gemmy variety of tourmaline (usually, but not always, elbaite or fluor-elbaite). Molecular Weight: 1059.4 g/mol. ... Chemical Formula: Na (Li1.5Al1.5) Al6 (Si6O18) (BO3) 3 (OH) 3 (OH) Elbaite: Na (Li1.5,Al1.5) Al6Si6O18 (BO3) 3 (OH) 4 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. Twenty-six additional cuprian tourmaline samples submitted by clients were analyzed with LA-ICP-MS for comparison. Interestingly, earth’s major source of boron is magma, or molten rock. ... Chemical Formula Na(Li 1. Hammers, Chisels, Loupes, Cotton-filled boxes, etc. Tourmaline has an idealized chemical formula of XY 3 Z 6 (T 6 O 18)(BO 3) 3 V 3 W. More from other references The basic chemical formula for Tourmaline is XY3Z6 (T6O18) (BO3)3V3W, where each letter can be replaced by a variety of different elements.