Titre du document / Document title

Vitimite, Ca⁶B¹⁴0(S0⁴1(OH)¹⁴.5H²0. A new mineral and conditions of its formation in Solongo deposit, Buryatia

Auteur(s) / Author(s)

CHUKANOV N. V. ; PEKOV L. V. ; MALINKO S. V. ; ZADOV A. E. ; DUBINCHUK V. T. ;

Résumé / Abstract

A ness mineral vitimite has been found in boron ores of Solongo ore deposit in Buryatia, Russia, occurring as veinlets, together with calcite, priceite, fedorovskite kutehatovite, ludwigite, magnetite, sphalerite and pyrite, and in Novofrolovskoe deposit, at the Polar Urals, together with calcite, uralborite and serpentine. The mineral forms white fibrous aggregates (fibers up to 0.2 mm in length). Vitimite is viscous ; Mohs'hardness 1.5. biaxial, negative. a = =1.532(3), Β = 1537(1), y = 1.540(1). D^eals= 2.24(3)g/cm₃, _Dmeas = 2.29(3)g/cm₃. Vitimite is monoclinic. pseudohexagonal, space group P2/ m. P2. or Pm; a=..= 14.10(2) b = 19.53(1),c = 14.05(2), Å; Z = 4. Chemical composition (microprobe; H²0 was determined by thermogravimetrical procedure, mass %): CaO 31.25. B2O³ 43.51, SO³ 7.16, H²0 18.9; Na, K, Mg. Sr, Ba, Al, MD, Fe, Si, Clnot found;total 100.82. Empirical formula: Ca⁶.²³Bi¹³.⁹⁸O^19.24(SO⁴)(OH)¹³i; " 4.78H²O. Simplified, formula: Ca⁶B¹⁴O⁹[S0⁴](OH)¹⁴. 5H²O. Strong lines of X-ray powder diffraction pattern,. d, A (I) (hkl) are: 12.2 (10) (100) 001); 3.45 (5) (333, 212); 3. 036 (6) (400. 0041, 2.720 (7) (171, 170, 071); 1. 992 (5) (403. 626, 541, 304, 417). Bands of water molecules and groups OH SO⁴, B0⁴ are present in the IR spetrum of vitimite.Single crystal electron microdiffraction pattern is given. I---k^plK^c= = -0. 013. Type material is deposited al the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia.

Revue / Journal Title

Zapiski Vserossijskogo mineralogičeskogo obŝestva   ISSN 0869-6055 

Source / Source

2002, vol. 131, n^o4, pp. 41-46 [6 page(s) (article)]

Langue / Language

Russe

Editeur / Publisher

Nauka, Sankt-Peterburg, RUSSIE, FEDERATION DE  (1992) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 4673, 35400010996552.0040