Home Physical Sciences Maruyamaite, K(MgAl2)(Al5Mg)Si6O18(BO3)3(OH)3O, a potassium-dominant tourmaline from the ultrahigh-pressure Kokchetav massif, northern Kazakhstan: Description and crystal structure
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Maruyamaite, K(MgAl2)(Al5Mg)Si6O18(BO3)3(OH)3O, a potassium-dominant tourmaline from the ultrahigh-pressure Kokchetav massif, northern Kazakhstan: Description and crystal structure

  • Aaron Lussier , Neil A. Ball , Frank C. Hawthorne EMAIL logo , Darrell J. Henry , Rentaro Shimizu , Yoshihide Ogasawara and Tsutomu Ota
Published/Copyright: February 18, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 2

Abstract

Maruyamaite, ideally K(MgAl2)(Al5Mg)Si6O18(BO3)3(OH)3O, was recently approved as the first K-dominant mineral-species of the tourmaline supergroup. It occurs in ultrahigh-pressure quartzofeldspathic gneisses of the Kumdy-Kol area of the Kokchetav Massif, northern Kazakhstan. Maruyamaite contains inclusions of microdiamonds, and probably crystallized near the peak pressure conditions of UHP metamorphism in the stability field of diamond. Crystals occur as anhedral to euhedral grains up to 2 mm across, embedded in a matrix of anhedral quartz and K-feldspar. Maruyamaite is pale brown to brown with a white to very pale-brown streak and has a vitreous luster. It is brittle and has a Mohs hardness of ∼7; it is non-fluorescent, has no observable cleavage or parting, and has a calculated density of 3.081 g/cm3. In plane-polarized transmitted light, it is pleochroic, O = darkish brown, E = pale brown. Maruyamaite is uniaxial negative, ω = 1.634, ε = 1.652, both ±0.002. It is rhombohedral, space group R3m, a = 15.955(1), c = 7.227(1) Å, V = 1593(3) Å3, Z = 3. The strongest 10 X-ray dif- fraction lines in the powder pattern are [d in Å(I)(hkl)]: 2.581(100)(051), 2.974(85)(1̄32), 3.995 (69)(2̄40), 4.237(59)(2̄31), 2.046(54)(1̄62), 3.498(42)(012), 1.923(36)(3̄72), 6.415(23)(1̄11), 1.595(22)(5̄.10.0), 5.002(21)(021), and 4.610(20)(030). The crystal structure of maruyamaite was refined to an R1 index of 1.58% using 1149 unique reflections measured with MoKα X-radiation. Analysis by a combination of electron microprobe and crystal-structure refinement gave SiO2 36.37, Al2O3 31.50, TiO2 1.09, Cr2O3 0.04, Fe2O3 0.33, FeO 4.01, MgO 9.00, CaO 1.47, Na2O 0.60, K2O 2.54, F 0.30, B2O3(calc) 10.58, H2O(calc) 2.96, sum 100.67 wt%. The formula unit, calculated on the basis of 31 anions pfu with B = 3, OH = 3.24 apfu (derived from the crystal structure) and the site populations assigned to reflect the mean interatomic distances, is (K0.53Na0.19Ca0.26□0.02)ΣX=1.00(Mg1.19Fe0.552+Fe0.053+ Ti0.14Al1.07)□Y=3.00(Al5.00Mg1.00)(Si5.97Al0.03O18)(BO3)3(OH)3(O0.602−F0.16OH0.24). Maruyamaite, ideally K(MgAl2) (Al5Mg)(BO3)3(Si6O18)(OH)3O, is related to oxy-dravite: ideally Na(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3O, by the substitution XK → XNa.

Keywords: Maruyamaite; tourmaline; new mineral; electron-microprobe analysis; optical properties; crystal-structure refinement; Kokchetav Massif; northern Kazakhstan; ultrahigh-pressure; microdiamond inclusions

Acknowledgments

We thank Andreas Ertl and an anonymous reviewer for their useful comments on this paper. This work was supported by a University of Manitoba Graduate Fellowship to A.L., a Canada Research Chair in Crystallography and Mineralogy to F.C.H., and by Natural Sciences and Engineering Research Council of Canada Discovery, Research Tools and Equipment, and Major Facilities Access grants, and by Canada Foundation for Innovation grants, to F.C.H. Some investigations of the petrologic applications of tourmaline benefited from NSF funding to D.J.H. from grant EAR-9405747. The petrographic work and Raman spectroscopy were funded by the Japan Society for the Promotion of Science Grant-in-Aid no. 15204050 to Y.O.

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  1. Manuscript handled by Beda Hofmann

Received: 2015-3-11
Accepted: 2015-9-10
Published Online: 2016-2-18
Published in Print: 2016-2-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5359
Keywords for this article
Maruyamaite; tourmaline; new mineral; electron-microprobe analysis; optical properties; crystal-structure refinement; Kokchetav Massif; northern Kazakhstan; ultrahigh-pressure; microdiamond inclusions

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  14. Mafic replenishments into floored silicic magma chambers
  15. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  16. Hafnium, oxygen, neodymium, strontium, and lead isotopic constraints on magmatic evolution of the supereruptive southern Black Mountains volcanic center, Arizona, U.S.A.: A combined LASS zircon–whole-rock study
  17. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  18. Deciphering magmatic processes in calc-alkaline plutons using trace element zoning in hornblende
  19. Special Collection: Geology and Geobiology of Lassen Volcanic National Park
  20. The Lassen hydrothermal system
  21. Article
  22. Maruyamaite, K(MgAl2)(Al5Mg)Si6O18(BO3)3(OH)3O, a potassium-dominant tourmaline from the ultrahigh-pressure Kokchetav massif, northern Kazakhstan: Description and crystal structure
  23. Article
  24. The valence quadrupole moment
  25. Article
  26. Crystal chemistry and light elements analysis of Ti-rich garnets
  27. Article
  28. XRD-TEM-AEM comparative study of n-alkylammonium smectites and interstratified minerals in shallow-diagenetic carbonate sediments of the Basque-Cantabrian Basin
  29. Article
  30. Mechanical properties of natural radiation-damaged titanite and temperature-induced structural reorganization: A nanoindentation and Raman spectroscopic study
  31. Article
  32. Jianshuiite in oceanic manganese nodules at the Paleocene-Eocene boundary
  33. Article
  34. The effect of phosphorus on manganocolumbite and mangaotantalite solubility in peralkaline to peraluminous granitic melts
  35. Article
  36. Interpretation of the infrared spectra of the lizardite-nepouite series in the near- and mid-infrared range
  37. Article
  38. In situ spectroscopic study of water intercalation into talc: New features of 10 Å phase formation
  39. Article
  40. Phase relations on the K2CO3-CaCO3-MgCO3 join at 6 GPa and 900–1400 °C: Implications for incipient melting in carbonated mantle domains
  41. Article
  42. Genesis of chromium-rich kyanite in eclogite-facies Cr-spinel-bearing gabbroic cumulates, Pohorje Massif, Eastern Alps
  43. Article
  44. Ferri-kaersutite, NaCa2(Mg3TiFe3+)(Si6Al2)O22O2, a new oxo-amphibole from Harrow Peaks, Northern Victoria Land, Antarctica
  45. Article
  46. In defense of magnetite-ilmenite thermometry in the Bishop Tuff and its implication for gradients in silicic magma reservoirs
  47. Letter
  48. Incorporation of high amounts of Na in ringwoodite: Possible implications for transport of alkali into lower mantle
  49. New Mineral Names
  50. New Mineral Names*,†
  51. Review
  52. American Mineralogist thanks the year 2015 reviewers
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