Mineralogy Database

Betpakdalite Mineral Data

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General Betpakdalite Information

Help on Chemical  Formula: Chemical Formula: [Mg(H2O)6]Ca2(H2O)13[Mo++++++8As+++++2Fe+++3O36(OH)]•4(H2O)
Help on Composition: Composition: Molecular Weight = 2,196.70 gm
   Calcium      3.65 %  Ca    5.11 % CaO
   Magnesium    1.11 %  Mg    1.83 % MgO
   Iron         7.63 %  Fe   10.90 % Fe2O3
   Molybdenum  34.94 %  Mo   52.42 % MoO3
   Arsenic      6.82 %  As   10.46 % As2O5
   Hydrogen     2.16 %  H    19.27 % H2O
   Oxygen      43.70 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgCa2Mo8As2Fe3+3O36(OH)•23(H2O)
Help on Environment: Environment: Oxidized Mo-As-Fe ores.
Help on IMA Status: IMA Status: Approved IMA 1961
Help on Locality: Locality: Bet-Pak-Dal desert, Kazakhstan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Betpakdalite + Pronunciation Say BETPAKDALITE
Help on Synonym: Synonym: ICSD 30798
  PDF 37-434

Betpakdalite Image

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Comments: Yellow crust of betpakdalite on quartzite.
Location: Sadisdorf, Erzgebirge, Sachsen, Germany. Scale: 10 x 6 cm.
© Thomas Witzke / Abraxas-Verlag

Betpakdalite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.7659:1:1.3794
Help on Cell Dimensions: Cell Dimensions: a = 19.531, b = 11.06, c = 15.257, Z = 2; beta = 131.57° V = 2,465.67 Den(Calc)= 2.96
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.91(1), 7.3(0.5), 11.49(0.4),

Physical Properties of Betpakdalite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Bright lemon yellow, Greenish yellow.
Help on Density: Density: 2.98 - 3.05, Average = 3.01
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Powdery - Forms a loose, poorly-coherent pulverulent mass.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous - Waxy

Optical Properties of Betpakdalite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.071 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2735,KPDmeas= 0.2685,KC= 0.2555
Ncalc = 1.76 - 1.78
Help on Optical Data: Optical Data: Biaxial (+), a=1.782, b=1.797, g=1.85, bire=0.0680, 2V(Calc)=58, 2V(Meas)=60. Dispersion extreme.
Help on Pleochroism (x): Pleochroism (x): pale yellow.
Help on Pleochroism (y): Pleochroism (y): greenish yellow.
Help on Pleochroism (z): Pleochroism (z): green.

Calculated Properties of Betpakdalite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.91 gm/cc
note: Specific Gravity of Betpakdalite =3.02 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEBetpakdalite = 62.87 barns/electron
U=PEBetpakdalite x rElectron Density= 182.77 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Betpakdalite is Not Radioactive

Betpakdalite Classification

Help on  Dana Class: Dana Class: (49)Basic and Hydrated Molybdates and Tungstates
  (49.04)(Compound Anions)
  (49.04.01)Dana Group Betpakdalite [Mg(H2O)6]Ca2(H2O)13[Mo8As2Fe3O36(OH)]•4(H2O) C 2/m 2/m
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 Betpakdalite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(AmMin, V85, p266) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Betpakdalite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DM.15





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