Gritsenkoite

CoMg2(AsO4)2(H2O)8
IMA status
  • Approved
  • Pending publication
IMA symbol
Grk
Also known as
  • Gritsenkoiet
  • IMA2025-052

Where it forms, where it's found

Type locality
Khovu-Aksy Ni-Co deposit
  1. Chedi-Kholsky District
  2. Tuva
  3. Russia

51.1597°, 93.6858°

1recorded occurrences
Source · OpenStreetMap

Safety & handling

Crystallography

Crystal system
Monoclinic
Space group
C2/m
Cell parameters
a = 10.2594(4) Å · b = 13.4338(4) Å · c = 4.7528(4) Å
Cell angles
β = 105.166(7) °
Ratio a:b:c
1 : 1.309 : 0.463

Chemical composition

Constituent elements
Mass composition breakdown
ElementAtoms At. mass g/mol Mass g/molMass share
8OOxygenOxygen1615.999255.984
48.34%
33AsArsenicArsenic274.922149.844
28.30%
27CoCobaltCobalt158.93358.933
11.13%
12MgMagnesiumMagnesium224.30548.610
9.18%
1HHydrogenHydrogen161.00816.128
3.05%
Total529.499100.00%

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

From Mindat formula

Synonyms

  • Gritsenkoiet
  • IMA2025-052

In other languages

German
Gritsenkoit · IMA 2025-052

Classification

Strunz
10th ed.

8.CE.40

  • 8Phosphates, Arsenates, VanadatesClass
  • 8.CPhosphates without additional anions, with H2ODivision
  • 8.CEWith only medium-sized cations, RO4:H2O about 1:2.5Group
  • 8.CE.40GritsenkoiteSpecies

Group, growth & confusion

In the same group
13 members

Literature, links & citation

Citations
  1. 1996Rojo, J.M.; Mesa, J.L.; Pizarro, J.L.; Lezama, L.; Arriortua, M.I.; Rojo, T. (1996) Spectroscopic and magnetic study of the (Mg,M)3(AsO4)2·8H2O (M = Ni2+, Co2+) arsenates. Materials Research Bulletin, 31 (8). 925-934 doi:10.1016/s0025-5408(96)00088-8DOI: 10.1016/s0025-5408(96)00088-8
  2. 2025Bosi, Ferdinando; Hatert, Frédéric; Pasero, Marco; Mills, Stuart J. (2025) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 88. Mineralogical Magazine, 89. 1-11 doi:10.1180/mgm.2025.10183DOI: 10.1180/mgm.2025.10183
  3. 2026Majzlan, Juraj; Többens, Daniel M; Lengauer, Christian (2026) Cation ordering in the annabergite-erythrite-hörnesite solid solutions. Mineralogy and Petrology. doi:10.1007/s00710-025-00963-9DOI: 10.1007/s00710-025-00963-9
Cite this entry
@misc{mineral2026,
  author    = {Mineral Index editorial board},
  title     = {Gritsenkoite — Mineral Index},
  year      = {2026},
  url       = {https://mineralindex.org/minerals/gritsenkoite-498749},
  note      = {Accessed 2026-05-11}
}