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Bykovaite Mineral Data

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General Bykovaite Information

Help on Chemical  Formula: Chemical Formula: BaNa{(Na,Ti)4[(Ti,Nb)2(OH,O)3Si4O14](OH,F)2}•3H2O
Help on Composition: Composition: Molecular Weight = 824.26 gm
   Potassium   0.57 %  K     0.69 % K2O
   Barium     11.83 %  Ba   13.21 % BaO
   Sodium      9.87 %  Na   13.31 % Na2O
   Strontium   0.53 %  Sr    0.63 % SrO
   Calcium     0.15 %  Ca    0.20 % CaO
   Titanium   11.33 %  Ti   18.90 % TiO2
   Manganese   1.73 %  Mn    2.24 % MnO
   Niobium     7.44 %  Nb   10.64 % Nb2O5
   Aluminum    0.07 %  Al    0.12 % Al2O3
   Iron        0.20 %  Fe    0.26 % FeO
   Silicon    13.56 %  Si   29.01 % SiO2
   Hydrogen    1.12 %  H     9.98 % H2O
   Oxygen     40.20 %  O
   Fluorine    1.41 %  F     1.41 % F
                -   %   F    -0.59 % -O=F2    
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.47K0.12Sr0.05Na3.07Ti0.61Mn2+0.26Ca0.03Fe2+0.03Ti1.34Nb0.66Si3.98Al0.02O14(OH)3.13 F0.61O0.58�3(H2O)
Help on Environment: Environment: Pegmatite vein consisting of a central ussingitic core surrounded by a zone of mostly microcline and aegirine at the margins, and lies in poikilitic nepheline-sodalite syenite. Hete rophyllosilicate pseudomorphous after
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Alluaiv, Lovozero Massif, Kola, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named to honor analytical chemist Alexandra Vasilyevna Bykova (1917-2001), who first discovered that bornemanite could be transformed to a synthetic form of bykovaite upon treatment with water.
Help on Synonym: Synonym: IMA2003-044
 

Bykovaite Image

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  Bykovaite

Comments: Creamy transparent silky bykovaite crystals in matrix.
Location: Mt. Alluaiv, Lovozero, Kola, Russia. Scale: Not Given.
© Diederik Visser

Bykovaite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7733:1:7.0956
Help on Cell Dimensions: Cell Dimensions: a = 5.552, b = 7.179, c = 50.94, Z = 4; beta = 91.1° V = 2,029.98 Den(Calc)= 2.70
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: I11b
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 25.5(1), 3.17(0.74), 8.48(0.72),2.763(0.2), 2.11(0.14), 3.44(0.14), 12.68(0.14), 5.11(0.11),
 

Physical Properties of Bykovaite

Help on Cleavage: Cleavage: {001} Perfect, {100} Imperfect
Help on Color: Color: Creamy yellow, Pale yellow.
Help on Density: Density: 2.98
Help on Diaphaneity: Diaphaneity: Semitransparent
Help on Fracture: Fracture: Brittle - Splintery - Brittle fracture leaving splintery fragments.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Silky
Help on Streak: Streak: white
 

Optical Properties of Bykovaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.071 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.025 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.254,KPDmeas= 0.2301,KC= 0.2477
Ncalc = 1.67 - 1.74
Help on Optical Data: Optical Data: Biaxial (+), a=1.668, b=1.679, g=1.71, bire=0.0420
 

Calculated Properties of Bykovaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.60 gm/cc
note: Specific Gravity of Bykovaite =2.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.04
Boson Index = 0.96
Help on Photoelectric: Photoelectric: PEBykovaite = 63.92 barns/electron
U=PEBykovaite x relectron= 166.24 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 7.89 (Gamma Ray American Petroleum Institute Units)
Concentration of Bykovaite per GRapi unit = 12.67 (%)

Estimated Radioactivity from Bykovaite - barely detectable

 

Bykovaite Classification

Help on  Dana Class: Dana Class: 56.04.02.02 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.04)with [Si2O7] with phosphate, water
  (56.04.02)Bornemanite Group
 
56.04.02.01 Bornemanite BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}•PO4 I11b m
 
56.04.02.02 Bykovaite! BaNa{(Na,Ti)4[(Ti,Nb)2(OH,O)3Si4O14](OH,F)2}•3H2O I11b 2
Help on  Strunz Class: Strunz Class: 09.BE.50 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.50 Bornemanite BaNa3{(Na,Ti)4[(Ti,Nb)2O2Si4O14](F,OH)2}•PO4 I11b m
 
09.BE.50 Shkatulkalite! {(Na,Mn,Ca,[])4[Nb2(O,H2O)4Si4O14](OH,F)2}•2(H2O,[]) P 2,Pm,P 2/m Mono
 
09.BE.50 Bykovaite! BaNa{(Na,Ti)4[(Ti,Nb)2(OH,O)3Si4O14](OH,F)2}•3H2O I11b 2
 

Other Bykovaite Information

Help on References: References: NAME( AmMin, v91, p1452) PHYS. PROP.(AmMin, v91, p1452) OPTIC PROP.(AmMin, v91, p1452)
Help on See Also: See Also: Links to other databases for Bykovaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Bykovaite

BaNa{(Na,Ti)4[(Ti,Nb)2(OH,O)3Si4O14](OH,F)2}•3H2O
Dana No: 56.04.02.02 Strunz No: 09.BE.50
Locality:

 

Notes:

 

 
   
 


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