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Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny massif, Kola Peninsula, Russia: A novel type of octahedral-tetrahedral open-framework structure

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Published/Copyright: January 7, 2016
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American Mineralogist
From the journal American Mineralogist Volume 92 Issue 8-9

Abstract

Yakovenchukite-(Y), K3NaCaY2[Si12O30](H2O)4, is a new REE silicate found in a thin (3-4 cm) sodalite-aegirine-microcline veinlet cutting ijolite-urtite at Mt. Kukisvumchorr, Khibiny alkaline massif, Kola Peninsula, Russia. The mineral occurs as small prismatic crystals in intimate association with microcline, aegirine, calcite, catapleiite, donnayite-(Y), Fluorapophyllite, Fluorite, galena, lead, litharge, molybdenite, natrolite-gonnardite, pyrochlore, rinkite, strontianite, and vuorijarvite-K. Yakovenchukite-(Y) is creamy to colorless, with vitreous luster. The streak is white. The mineral is transparent, non-fluorescent. The Mohs hardness is about 5. The mineral is brittle. Cleavage is perfect on {100}, distinct on {010}, fracture is stepped. Densities are 2.83 g/cm3 (measured by sink/float in heavy liquids) and 2.72 g/cm3 (calculated). Yakovenchukite-(Y) is biaxial (+): nα = 1.520(5), nβ = 1.525(5), nγ = 1.538(5) (589 nm), 2V(meas.) = 60 ± 5°, 2V(calc.) = 61.86°. The optical orientation is Y = c, X = a, Z = b, pleochroism is not observed. Chemical analysis by electron microprobe (wt%): Na2O 4.32, K2O 10.73, CaO 3.42, Y2O3 15.49, Ce2O3 0.10, Dy2O3 0.68, Er2O3 0.88, Tm2O3 0.18, Yb2O3 1.53, ThO2 0.62, SiO2 57.55, H2O (by the Penfield method) 4.70, total 100.20. The empirical formula (based on Si = 12 apfu) is (K2.85 Na0.15)Σ3.00 Na1.00 (Ca0.71 Na0.60)Σ1.31 (Y1.72 Yb0.10 Er0.06 Dy0.05 Th0.03 Ce0.01 Tm0.01 Ca0.05)Σ2.03 [Si12 O30.02]·3.27H2O. According to single-crystal X-ray study yakovenchukite-(Y) is orthorhombic, Pcca, a = 14.972(8), b = 14.137(7), c = 14.594(8) Å, V = 3089(3) Å3, Z = 4. The strongest lines of the X-ray powder diffraction pattern are [dbs(Å) (Iobs) (hkl)]: 7.00 (40) (020), 6.57 (60) (102), 4.20 (50) (222), 3.337 (100) (331), 3.248 (90) (024), 3.101 (40) (142), 3.014 (80) (422), 2.608 (40) (404). The crystal structure of yakovenchukite-(Y) belongs to a new structure type of minerals and inorganic compounds. It is based on microporous octahedral-tetrahedral framework of SiO4-tetrahedra and YO6-octahedra. Silicate tetrahedra share corners to form unprecedented [Si12O30] sheets consisting of 4-, 6-, and 14-membered rings. The sheets are parallel to (001) and are linked into 3D framework through YO6 octahedra. Ca2+, K+, and Na+ cations are located within the framework cavities. The octahedral- tetrahedral framework possess channels extended along the a axis. The channel dimensions are 4.9 × 6.2 Å, which means the free crystallographic diameter of 2.2 × 3.5 Å, that allows classifying yakovenchukite-(Y) as a microporous material. Yakovenchukite-(Y) is the latest low-temperature hydrothermal mineral, formed by alteration of earlier REE-rich minerals (pyrochlore, rinkite, etc.). The mineral is named in honor of Victor N. Yakovenchuk, a mineralogist at the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences, for his outstanding contribution to the mineralogy of alkaline and alkaline-ultrabasic massifs

Keywords: Yakovenchukite-(Y); new mineral; REE-silicate; crystal structure; ultra-alkaline hydrothermal vein; Khibiny massif; Kola Peninsula
Received: 2006-10-26
Accepted: 2007-4-13
Published Online: 2016-1-7
Published in Print: 2007-8-1

© 2016 by Walter de Gruyter Berlin/Boston

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  3. Single-crystal X-ray diffraction study of high-pressure phases of KHCO3
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  26. The crystal structure of pyroxenes along the jadeite hedenbergite and jadeite aegirine joins
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  29. Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny massif, Kola Peninsula, Russia: A novel type of octahedral-tetrahedral open-framework structure
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https://doi.org/10.2138/am.2007.2488
Keywords for this article
Yakovenchukite-(Y); new mineral; REE-silicate; crystal structure; ultra-alkaline hydrothermal vein; Khibiny massif; Kola Peninsula

Articles in the same Issue

  1. Occurrence and origin of minerals in a chamosite-bearing coal of Late Permian age, Zhaotong, Yunnan, China
  2. Crystal-chemical and carbon-isotopic characteristics of karpatite (C24H12) from the Picacho Peak Area, San Benito County, California: Evidences for the hydrothermal formation
  3. Single-crystal X-ray diffraction study of high-pressure phases of KHCO3
  4. Stress-induced redistribution of yttrium and heavy rare-earth elements (HREE) in garnet during high-grade polymetamorphism
  5. The role of volatile transport by diffusion and dispersion in driving biotite-forming reactions during regional metamorphism of the Gile Mountain Formation, Vermont
  6. Laser Raman microspectrometry of metamorphic quartz: A simple method for comparison of metamorphic pressures
  7. Al,Si order in albite and its effect on albite dissolution processes: A Monte Carlo study
  8. Structural state of microcrystalline opals: A Raman spectroscopic study
  9. A Monte Carlo investigation of the thermodynamics of cation ordering in 2-3 spinels
  10. Modeling the plastic deformation of olivine by dislocation dynamics simulations
  11. Heat capacity of hydration in zeolites
  12. Imaging of dioctahedral 2:1 layers by high-resolution transmission electron microscopy (HRTEM): Possibility of recording the dehydroxylate
  13. Geochemical variations in late-stage growth of volcanic phenocrysts revealed by SIMS depth-profiling
  14. Characterization of mineral surfaces using FIB and TEM: A case study of naturally weathered alkali feldspars
  15. Crystal structure and chemical composition of Li-, Fe-, and Mn-rich micas
  16. Microbial effects in promoting the smectite to illite reaction: Role of organic matter intercalated in the interlayer
  17. Microbial reduction of structural Fe3+ in nontronite by a thermophilic bacterium and its role in promoting the smectite to illite reaction
  18. Unique properties of lunar impact glass: Nanophase metallic Fe synthesis
  19. Aluminotaramite, alumino-magnesiotaramite, and fluoro-alumino-magnesiotaramite: Mineral data and crystal chemistry
  20. Pressure-induced slip-system transition in forsterite: Single-crystal rheological properties at mantle pressure and temperature
  21. Elastic behavior and pressure-induced structural evolution of nepheline: Implications for the nature of the modulated superstructure
  22. Pressure-induced change in the compressional behavior of the O-H bond in chrysotile: A Raman high-pressure study up to 4.5 GPa
  23. Jarosite-hydronium jarosite solid-solution series with full iron site occupancy: Mineralogy and crystal chemistry
  24. Hydrogen bonded silanols in the 10 Å phase: Evidence from NMR spectroscopy
  25. Mössbauer spectroscopy of Zn-poor and Zn-rich rhodonite
  26. The crystal structure of pyroxenes along the jadeite hedenbergite and jadeite aegirine joins
  27. Temperature dependence of IR absorption of hydrous/hydroxyl species in minerals and synthetic materials
  28. The crystal structure of meurigite
  29. Yakovenchukite-(Y), K3NaCaY2(Si12O30)(H2O)4, a new mineral from the Khibiny massif, Kola Peninsula, Russia: A novel type of octahedral-tetrahedral open-framework structure
  30. Letter. Novel 2:1 structure of phyllosilicates formed by annealing Fe3+, Mg-rich dioctahedral mica
  31. Letter. Experimental study of radium partitioning between anorthite and melt at 1 atm
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