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Mushroom elbaite from the Kat Chay mine, Momeik, near Mogok, Myanmar: II. Zoning and crystal growth

Published online by Cambridge University Press:  05 July 2018

A. J. Lussier ,
F. C. Hawthorne ,
S. Herwig ,
Y. Abdu ,
P. M. Aguiar ,
V. K. Michaelis  and
S. Kroeker
A. J. Lussier
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba Canada R3T 2N2
F. C. Hawthorne*
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba Canada R3T 2N2
S. Herwig
Affiliation:
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba Canada R3T 2N2
Y. Abdu
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, Manitoba Canada R3T 2N2
P. M. Aguiar
Affiliation:
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba Canada R3T 2N2
V. K. Michaelis
Affiliation:
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba Canada R3T 2N2
S. Kroeker
Affiliation:
Department of Chemistry, University of Manitoba, Winnipeg, Manitoba Canada R3T 2N2
*
*E-mail: [email protected]
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Abstract

A variety of mushroom tourmaline from the Kat Chay mine, Momeik, near Mogok, Shan state, Myanmar, consists of a black-to-grey single-crystal core from which a single prismatic crystal reaches to the edge of the mushroom, forming a slight protuberance. The rest of the mushroom (∼50% by volume) consists of extremely acicular sub-parallel crystals that diverge toward the edge of the mushroom. The acicular crystals are dominantly colourless to white, with a continuous black zone (2 mm across) near the edge, and pale pink outside the black zone. The composition varies from ∼Na0.75Ca0.05(Li0.80Al0.70Fe1.10.Mn0.30Ti0.10)Al6Si6(B03)3O18(OH)3(OH,F) at the base of the mushroom to ∼Na0.60Ca0.06(Li1.00Al1.98Fe0.02)Al6(Si5.35B0.65)(BO3)3O18(OH)3(OH,F) close to the edge at the top of the mushroom. The principal substitutions are: (1) YLi + YAl -> yFe* + yFe* and (2) TB + yAl -> Si + yFe*, but there are five other minor substitutions that are also operative. There are six significant compositional discontinuities at textural boundaries in the mushroom, suggesting that the changes in habit are driven in part by changes in external variables such as T and P, plus possible involvement of new fluid phases.

Keywords

elbaitetourmalineelectron microprobe analysiszoningMogokMyanmar
Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 5 , October 2008 , pp. 999 - 1010
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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References

Bloodaxe, E.S., Hughes, J.M., Dyar, M.D., Grew, E.S. and Guidotti, C.V. (1999) Linking structure and chemistry in the schorl-dravite series. American Mineralogist, 84, 922–928.CrossRefGoogle Scholar
Cempírek, J., Novak, M., Ertl, A., Hughes, J.M., Rossman, G.R. and Dyar, M.D. (2006) Fe-bearing olenite with tetrahedrally coordinated Al from an abyssal pegmatite at Kutna Hora, Czech Republic: structure, crystal chemistry, optical and XANES spectra. The Canadian Mineralogist, 44, 23–30.CrossRefGoogle Scholar
Dutrow, B.L. and Henry, DJ. (2000) Complexly zoned fibrous tourmaline, Cruzeiro Mine, Minas Gerais, Brazil: a record of evolving magmatic and hydro-thermal fluids. The Canadian Mineralogist, 38, 131–143.CrossRefGoogle Scholar
Ertl, A. and Hughes, J.M. (2002) The crystal structure of an aluminum-rich schorl overgrown by boron-rich olenite from Koralpe, Styria, Austria. Mineralogy and Petrology, 75, 69–78.CrossRefGoogle Scholar
Ertl, A., Pertlik, F. and Berhardt, H.-J. (1997) Investigations on olenite with excess boron from the Koralpe, Styria, Austria. Anzeiger, 134, 3–10.Google Scholar
Ertl, A., Hughes, J.M., Brandstatter, F., Dyar, M.D. and Prasad, P.S.R. (2003) Disordered Mg-bearing olenite from a granitic pegmatite from Goslarn, Austria: A chemical, structural and infrared spectroscopic study. The Canadian Mineralogist, 41, 1363–1370.CrossRefGoogle Scholar
Ertl, A., Rossman, G.R., Hughes, J.M., Prowatke, S. and Ludwig, T. (2005) Mn-bearing “oxy-rossmanite” with tetrahedrally coordinated Al and B from Austria: structure, chemistry, and infrared and optical spectroscopy. American Mineralogist, 90, 481–487.CrossRefGoogle Scholar
Ertl, A., Hughes, J.M., Prowatke, S., Ludwig, T., Prasad, P.S.R., Brandstatter, F., Korner, W., Schuster, R., Pertlik, F. and Marschall, H. (2006) Tetrahedrally coordinated boron in tourmalines from the liddicoatite-elbaite series from Madagascar: structure, chemistry, and infrared spectroscopic studies. American Mineralogist, 91, 1847–1856.CrossRefGoogle Scholar
Ertl, A., Hughes, J.M., Prowatke, S., Ludwig, T., Brandstatter, F., Korner, W. and Dyar, M.D. (2007) Tetrahedrally coordinated boron in Li-bearing olenite from ‘Mushroom’ tourmaline from Momeik, Myanmar. The Canadian Mineralogist, 45, 891–899.CrossRefGoogle Scholar
Federico, M., Andreozzi, G.B., Lucchesi, S. and Graziani, G. (1998) Compositional variation of tourmaline in the granitic pegmatite dykes of the Cruziero mine, Minas Gerais, Brazil. The Canadian Mineralogist, 36, 415–431.Google Scholar
Foord, E.E., Starkey, H.C. and Taggert, J.E. Jr. (1986) Mineralogy and paragenesis of ‘pocket’ clays and associated minerals in complex granitic pegmatites, San Diego County, California. American Mineralogist, 71, 428–439.Google Scholar
Hughes, J.M., Ertl, A., Dyar, M.D., Grew, E.S., Shearer, C.K., Yates, M.G. and Guidotti, C.V. (2000) Tetrahedrally coordinated boron in tourmaline: boron-rich olenite from Stoffhutte, Koralpe, Austria. The Canadian Mineralogist, 38, 861–868.CrossRefGoogle Scholar
Hughes, K.-A., Hughes, J.M. and Dyar, M.D. (2001) Chemical and structural evidence for [4]B ⟺ [4]Si substitution in natural tourmalines. European Journal of Mineralogy, 13, 743–747.CrossRefGoogle Scholar
Hughes, J.M., Ertl, A., Dyar, M.D., Grew, E.S., Wieden-Beck, M. and Brandstatter, F. (2004) Structural and chemical response to varying [4]B content in zoned Fe-bearing olenite from Koralpe, Austria. American Mineralogist, 89, 447–454.CrossRefGoogle Scholar
Jolliff, B.L., Papike, JJ. and Shearer, C.K. (1986) Tourmaline as a recorder of pegmatite evolution: Bob Ingersoll pegmatite, Black Hills, South Dakota. American Mineralogist, 71, 472–500.Google Scholar
Kalt, A., Schreyer, W., Ludwig, T., Prowatke, S., Bernhardt, H.-J. and Ertl, A. (2001) Complete solid solution between magnesian schorl and lithian excess-boron olenite in a pegmatite from the Koralpe (eastern Alps, Austria). European Journal of Mineralogy, 13, 1191–1205.CrossRefGoogle Scholar
London, D. (1986) Formation of tourmaline-rich gem pockets in miarolitic pegmatites. American Mineralogist, 71, 396–405.Google Scholar
London, D. (1999) Stability of tourmaline in peraluminous granite systems: the boron cycle from anatexis to hydrothermal aureoles. European Journal of Mineralogy, 11, 253–262.CrossRefGoogle Scholar
London, D. and Manning, D.A.C. (1995) Chemical variation and significance of tourmaline from Southwest England. Economic Geology, 90, 495–519.CrossRefGoogle Scholar
Lussier, A.J., Aguiar, P.M., Michaelis, V.K, Kroeker, S., Herwig, S., Abdu, Y. and Hawthorne, F.C. (2008) Mushroom elbaite from the Kat Chay mine, Momeik, near Mogok, Myanmar: I. Crystal chemistry by SREF, EMPA, MAS NMR and Mössbauer spectroscopy. Mineralogical Magazine, 72, 747–761.CrossRefGoogle Scholar
Lussier, A.J., Aguiar, P., Michaelis, V., Kroeker, S. and Hawthorne, F.C. (2009) The occurrence of tetrahedrally coordinated Al and B in tourmaline: A 11B and 27Al MAS NMR study. American Mineralogist, (in press).CrossRefGoogle Scholar
Macdonald, DJ. and Hawthorne, F.C. (1995) The crystal chemistry of Si-Al substitution in tourmaline. The Canadian Mineralogist, 33, 849–858.Google Scholar
Marler, B. and Ertl, A. (2002) Nuclear magnetic resonance and infrared spectroscopic study of excess-boron olenite from Koralpe, Styria, Austria. American Mineralogist, 87, 364–367.CrossRefGoogle Scholar
Marler, B., Borowski, M., Wodara, U. and Schreyer, W. (2002) Synthetic tourmaline (olenite) with excess boron replacing silicon in the tetrahedral site: II. Structure analysis. European Journal of Mineralogy, 14, 763–771.CrossRefGoogle Scholar
Prowatke, S., Ertl, A. and Hughes, J.M. (2003) Tetrahedrally-coordinated Al in Mn-rich, Li- and Fe-bearing olenite from Eibenstein an der Thaya, Lower Austria: A chemical and structural investigation. Neues Jahrbuch fur Mineralogie, Monatshefte, 2003, 385–395.CrossRefGoogle Scholar
Schreyer, W., Wodara, U., Marler, B., van Aken, P.A., Seifert, F. and Robert, J.-L. (2000) Synthetic tourmaline (olenite) with excess boron replacing silicon in the tetrahedral site: I. Synthesis conditions, chemical and spectroscopic evidence. European Journal of Mineralogy, 12, 529–541.CrossRefGoogle Scholar
Schreyer, W., Hughes, J.M., Bernhardt, H.-J., Kalt, A., Prowatke, S. and Ertl, A. (2002) Reexamination of olenite from the type locality: detection of boron in tetrahedral coordination. European Journal of Mineralogy, 14, 935–942.CrossRefGoogle Scholar
Selway, J.B., Novàk, M., Černý, P. and Hawthorne, F.C. (1999) Compositional evolution of tourmaline in lepidolite-subtype pegmatites. European Journal of Mineralogy, 11, 569–584.CrossRefGoogle Scholar
Selway, J.B., Černý, P., Hawthorne, F.C. and Novàk, M. (2000) The Tanco pegmatite at Bernic Lake, Manitoba. XIV. Internal tourmaline. The Canadian Mineralogist, 38, 877–891.CrossRefGoogle Scholar
Selway, J.B., Smeds, S.-A., Černý, P. and Hawthorne, F.C. (2002) Compositional evolution of tourmaline in the petalite-subtype Nykopingsgruvan pegmatites, Utö, Stockholm Archipelago, Sweden. GFF, 124, 93–102.CrossRefGoogle Scholar
Tagg, S.L., Cho, H., Dyar, M.D. and Grew, E.S. (1999) Tetrahedral boron in naturally occurring tourmaline. American Mineralogist, 84, 1451–1455.CrossRefGoogle Scholar
Vorbach, A. (1989) Experimental examinations on the stability of synthetic tourmalines in temperatures from 250°C to 750°C and pressures up to 4 kb. Neues Jahrbuch fur Mineralogie Abhandlung, 161, 69–83.Google Scholar
Zaw, K (1998) Geological evolution of selected granitic pegmatites in Myanmar (Burma): constraints from regional setting, lithology, and fluid-inclusion studies. International Geology Review, 40, 647–662.CrossRefGoogle Scholar