Mineralogy Database

Natrobetpakdalite Mineral Data

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General Natrobetpakdalite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)3Fe+++2(As2Mo6O28)•15(H2O)
Help on Composition: Composition: Molecular Weight = 1,641.45 gm
   Sodium       2.80 %  Na    3.78 % Na2O
   Calcium      2.44 %  Ca    3.42 % CaO
   Iron         6.80 %  Fe    9.73 % Fe2O3
   Molybdenum  35.07 %  Mo   52.61 % MoO3
   Arsenic      9.13 %  As   14.00 % As2O5
   Hydrogen     1.84 %  H    16.46 % H2O
   Oxygen      41.91 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na2CaFe3+2As2Mo6O28•15(H2O)
Help on Environment: Environment: In the zone of oxidation of a molybdenum deposit.
Help on IMA Status: IMA Status: Approved IMA 1971
Help on Locality: Locality: Kazakhstan (?) Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the chemistry and similarity to betpakdalite.
Help on Synonym: Synonym: Sodium betpakdalite - Renamed to Natrobetpakdalite by Mineralogical Record, v39 (2008), p131

Natrobetpakdalite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5844:1:0.9155
Help on Cell Dimensions: Cell Dimensions: a = 11.28, b = 19.3, c = 17.67, Z = 4; beta = 94.5° V = 3,834.97 Den(Calc)= 2.84
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.73(1), 3.63(0.9), 1.84(0.8),

Physical Properties of Natrobetpakdalite

Help on Color: Color: Lemon yellow.
Help on Density: Density: 2.92
Help on Habit: Habit: Powdery - Forms a loose, poorly-coherent pulverulent mass.
Help on Luster: Luster: Earthy (Dull)

Optical Properties of Natrobetpakdalite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.105 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.136 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.282,KPDmeas= 0.2743,KC= 0.2483
Ncalc = 1.71 - 1.73
Help on Optical Data: Optical Data: Biaxial (?), a=1.792, g=1.81, bire=0.0180
Help on Pleochroism (x): Pleochroism (x): pale yellow.
Help on Pleochroism (z): Pleochroism (z): yellow.

Calculated Properties of Natrobetpakdalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.80 gm/cc
note: Specific Gravity of Natrobetpakdalite =2.92 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PENatrobetpakdalite = 64.67 barns/electron
U=PENatrobetpakdalite x rElectron Density= 180.84 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Natrobetpakdalite is Not Radioactive

Natrobetpakdalite Classification

Help on  Dana Class: Dana Class: (49)Basic and Hydrated Molybdates and Tungstates
  (49.04)(Compound Anions)
  (49.04.04)Dana Group Natrobetpakdalite (Na,Ca)3Fe2(As2Mo6O28)•15(H2O) Unk Mono
Help on  Strunz Class: Strunz Class: 08.DM.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DM -With large and medium-sized cations, (OH, etc.):RO4 > 2:1
08.DM.15 Betpakdalite [Mg(H2O)6]Ca2(H2O)13[Mo8As2Fe3O36(OH)]•4(H2O) C 2/m 2/m
08.DM.15 Melkovite CaFeH6(MoO4)4(PO4)•6(H2O) Unk. Mono
08.DM.15 Natrobetpakdalite (Na,Ca)3Fe2(As2Mo6O28)•15(H2O) Unk Mono

Other Natrobetpakdalite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Natrobetpakdalite :
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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Dana No: Strunz No: 08.DM.15





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