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Magnesio-arfvedsonite from Jade Mine Tract, Myanmar: mineral description and crystal chemistry

Published online by Cambridge University Press:  02 January 2018

Roberta Oberti ,
Massimo Boiocchi ,
Frank C. Hawthorne ,
Neil A. Ball  and
George E. Harlow
Roberta Oberti*
Affiliation:
CNR-Istituto di Geoscienze e Georisorse, UOS Pavia, via Ferrata 1, I-27100 Pavia, Italy
Massimo Boiocchi
Affiliation:
Centro Grandi Strumenti, Università di Pavia, via Bassi 21, I-27100 Pavia, Italy
Frank C. Hawthorne
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
Neil A. Ball
Affiliation:
Department of Geological Sciences, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada
George E. Harlow
Affiliation:
Department of Earth and Planetary Sciences, American Museum of Natural History, Central Park West at 79th Street New York, NY 10024-5192, USA
*
*E-mail: oberti@crystal.unipv.it
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Abstract

Magnesio-arfvedsonite, the CFe3+-dominant analogue of eckermannite, has been found in a sample of “szechenyite” in the mineral collection of the American Museum of Natural History (AMNH H35024). It comes from the northern part of the Jade Mine Tract near Hpakan, Kachin State, Myanmar. Associated minerals are kosmochlor–jadeite solid-solution pyroxene and clinochlore. The ideal formula of magnesio-arfvedsonite is ANaBNa2C(Mg4Fe3+)TSi8O22W(OH)2, and the empirical formula derived from electron microprobe analysis and single-crystal structure refinement for the sample of this work is A(Na0.96K0.04)Σ=1.00B(Na1.57Ca0.40Fe0.022+Mn0.01)Σ=2.00C(Mg4.26Fe0.192+Fe0.413+Al0.11Ti0.034+)Σ=5.00T(Si7.99Al0.01)Σ=8.00O22W[F0.02(OH)1.98]Σ=2.00. The unit-cell dimensions are a = 9.867(1), b = 17.928(2), c = 5.284(1) Å, β = 103.80(2)°, V = 907.7 (2) Å3, Z = 2. Magnesio-arfvedsonite is biaxial (–), with α = 1.624, β = 1.636, γ = 1.637, all ± 0.002 and 2Vobs = 36(1)°, 2Vcalc = 32°. The ten strongest reflections in the X-ray powder pattern [d values (in Å), I, (hkl)] are: 2.708, 100, (151); 3.399, 68, (131); 3.144, 63, (310); 2.526, 60, (202); 8.451, 46, (110); 3.273, 39, (240); 2.167, 37, (261); 2.582, 34, (061); 2.970, 34, (221); 2.326, 33, [(251) (421)].

Keywords

magnesio-arfvedsoniteeckermanniteamphiboleelectron-microprobe analysiscrystal-structure refinementJade Mine TractMyanmar
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 2 , April 2015 , pp. 253 - 260
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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References

Adamson, O.J. (1942) Eckermannite, a new alkali amphibole. Geologiska Föreningens i Stockholm Förhandlingar, 64, 329–334.CrossRefGoogle Scholar
Bartelmehs, K.L., Bloss, F.D., Downs, R.T. and Birch, J.B. (1992) EXCALIBR II. Zeitschrift für Kristallographie, 199, 185–196.CrossRefGoogle Scholar
Bruker (2003) SAINT Software Reference Manual. Version 6. Bruker AXS Inc., Madison, Wisconsin, USA.Google Scholar
Gay, P., Bancroft, G.M. and Bown, M.G. (1970) Diffraction and Mössbauer studies of minerals from lunar soils and rocks. Proceedings of the Apollo 11 Lunar Science Conference, 1, 481–497.Google Scholar
Ghose, S., Kersten, M., Langer, K., Rossi, G. and Ungaretti, L. (1986) Crystal field spectra and Jahn Teller effect of Mn3+ in clinopyroxene and clinoamphiboles from India. Physics and Chemistry of Minerals, 13, 291–305.CrossRefGoogle Scholar
Harlow, G.E. and Olds, E.P. (1987) Observations on terrestrial ureyite and ureyitic pyroxene. American Mineralogist, 72, 126–136.Google Scholar
Harlow, G.E., Sorensen, S.S., Sisson, V.B. and Shi, G. (2014) Chapter 10: The Geology of Jade Deposits. Pp. 305–374. in: The Geology of Gem Deposits, 2nd Edition (L.A. Groat, editor). Mineralogical Association of Canada Short Course Handbook Series, 44. Mineralogical Association of Canada, Québec, Canada.Google Scholar
Hawthorne, F.C. and Oberti, R. (2007) Amphiboles: crystal chemistry. Pp. 1–54. in: Amphiboles: Crystal Chemistry, Occurrence and Health Issues (Hawthorne, F.C., Oberti, R., Della Ventura, G. and Mottana, A., editors). Reviews in Mineralogy & Geochemistry, 67, Mineralogical Society of America and the Geochemical Society, Chantilly, Virginia, USA.Google Scholar
Hawthorne, F.C., Ungaretti, L. and Oberti, R. (1995) Site populations in minerals: terminology and presentation of results. The Canadian Mineralogist, 33, 907–911.Google Scholar
Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C. and Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist, 97, 2031–2048.CrossRefGoogle Scholar
Hughes, R.W., Galibert, O., Bosshart, G., Ward, F., Oo, T., Smith, M. Sun, T.T. and Harlow, G.E. (2000) Burmese jade: the inscrutable gem. Gems and Gemology, 36(1), 2–26.CrossRefGoogle Scholar
Lacroix, A. (1930) La jadeite de Birmanie: Les roches qu’elle constitue ou qui l’accompagnent. Composition et origine. Bulletin de la Société Française de Minéralogie, 53, 216–264.CrossRefGoogle Scholar
Mével, C. and Kiénast, J.R. (1986) Jadeite-kosmochlor solid solution and chromian sodic amphiboles in jadeitites and associated rocks from Tawmaw (Burma). Bulletin de Minéralogie, 109, 617–633.CrossRefGoogle Scholar
Miyashiro, A. (1957) The chemistry, optics, and genesis of the alkali-amphiboles. Journal of the Faculty of Science, the University of Tokyo, Sect. II, 11, 57–83.Google Scholar
Oberti, R., Hawthorne, F.C., Cannillo, E. and Cámara, F. (2007) Long-range order in amphiboles. Pp. 125–171. in: Amphiboles: Crystal Chemistry, Occurrence and Health Issues (Hawthorne, F.C., Oberti, R., Della Ventura, G. and Mottana, A., editors). Reviews in Mineralogy & Geochemistry, 67. Mineralogical Society of America and the Geochemical Society, Chantilly, Virginia, USA.CrossRefGoogle Scholar
Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A. and Harlow, G.E. (2014) Magnesio-arfvedsonite, IMA 2013-137. CNMNC Newsletter No. 20, June 2014, page 553; Mineralogical Magazine, 78, 549–558.Google Scholar
Oberti, R., Boiocchi, M., Hawthorne, F.C., Ball, N.A. and Harlow, G.E. (2015) Eckermannite revised. The new holotype from the Jade Mine Tract, Myanmar: crystal structure, mineral data and hints on the reasons for the rarity of eckermannite. American Mineralogist, 100, 909–914.CrossRefGoogle Scholar
Pouchou, J.L. and Pichoir, F. (1985) ‘PAP’ j(rZ) procedure for improved quantitative microanalysis. Pp. 104–160. in: Microbeam Analysis (J.T. Armstrong, editor). San Francisco Press, San Francisco, California, USA.Google Scholar
Sheldrick, G.M. (1996) SADABS Siemens Area Detector Absorption Correction Program. University of Göttingen, Göttingen, Germany.Google Scholar
Törnebohm, A. (1906) Katapleiit-syenit, en nyupptäkt variant af nefelinsyeniti Sverige. Sveriges Geologiska Undersökning, C 199, 1–54.Google Scholar
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