Betpakdalite-FeFe

[Fe3+2(H2O)15(OH)2Fe3+(H2O)6][Mo8As2Fe3+3O37]
IMA status
  • Approved
  • Pending publication
IMA symbol
Bpd-FeFe
IMA approved
2017
Also known as
  • IMA2017-011

Where it forms, where it's found

Type locality
Mount Moliagul
  1. Moliagul
  2. Central Goldfields Shire
  3. Victoria
  4. Australia

-36.7153°, 143.6389°

1recorded occurrences
Source · OpenStreetMap

Safety & handling

Crystallography

Crystal system
Monoclinic
Space group
C2/m
Cell parameters
a = 19.51(1) Å · b = 11.131(5) Å · c = 15.37(1) Å
Cell angles
β = 130.93(5) °
Ratio a:b:c
1 : 0.571 : 0.788

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen6015.999959.940
42.54%
42MoMolybdenumMolybdenum895.950767.600
34.01%
26FeIronIron655.845335.070
14.85%
33AsArsenicArsenic274.922149.844
6.64%
1HHydrogenHydrogen441.00844.352
1.96%
Total2256.806100.00%

Mass share = atoms × atomic mass ÷ molar mass × 100

From IMA formula

Synonyms

  • IMA2017-011

In other languages

German
Betpakdalit-FeFe · IMA 2017-011

Classification

Strunz
10th ed.

8.DM

  • 8Phosphates, Arsenates, VanadatesClass
  • 8.DPhosphates, etc. with additional anions, with H2ODivision
  • 8.DMWith large and medium-sized cations, (OH, etc.):RO4 > 2:1Group
  • 8.DMBetpakdalite-FeFeSpecies

Group, growth & confusion

In the same group
4 members

Literature, links & citation

Citations
  1. 2017Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017, CNMNC Newsletter No 37. Mineralogical Magazine, 81 (3) 737-742 doi:10.1180/minmag.2017.081.039DOI: 10.1180/minmag.2017.081.039
  2. 2021(2021) Betpakdalite-FeFe. Handbook of Mineralogy. Mineralogical Society of America
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Betpakdalite-FeFe — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/betpakdalite-fefe-51840},
  note      = {Accessed 2026-05-11}
}