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Gritsenkoite
A valid IMA mineral species - pending publication
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About Gritsenkoite
Oleg Igorevich Gritsenko
Formula:
CoMg2(AsO4)2(H2O)8
Colour:
reddish-pink
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
2.88
Crystal System:
Monoclinic
Member of:
Name:
after Russian researchers Oleg Igorevitch Gritsenko (28.03.1966- 01.08.2021) and his widow Yulia Dmitrievna Gritsenko (born 16.02.1979). Oleg Gritsenko was a professional geologist and geochemist who found his calling in teaching geology to children of different ages. In 1988, he created a children's geological club named "Geocompany" in Moscow, which is still actively working today. 
is a professional mineralogist, senior researcher at the Fersman Mineralogical Museum and senior lecturer at the Faculty of Geology of Moscow State University. She authored and co-authored more than 100 scientific papers and two new minerals - ferroskutterudite and odikhinchaite.
Yulia Gritsenko
The Co analogue of cabrerite.
cation-ordered arsenate member of the vivianite group, with Co dominant at M1 and Mg dominant at M2. ordered intermediate between erythrite and hörnesite.
Structure determined.
reinvestigation of "Co-bearing hörnesite" or "Mg rich erythrite" in collections can yield new samples and localities for gritsenkoite.
cation-ordered arsenate member of the vivianite group, with Co dominant at M1 and Mg dominant at M2. ordered intermediate between erythrite and hörnesite.
Structure determined.
reinvestigation of "Co-bearing hörnesite" or "Mg rich erythrite" in collections can yield new samples and localities for gritsenkoite.
Unique Identifiers
Mindat ID:
498749
Long-form identifier:
mindat:1:1:498749:5
IMA Classification of Gritsenkoite
Approved, Pending publication
IMA Formula:
Co2+Mg2(As5+O4)2(H2O)8
Approval year:
2025
Type description reference:
Kasatkin, Anatoly V.; Plášil, Jakub; Škoda, Radek; Rohlíček, Jan; Agakhanov, Atali A.; Ansermet, Stefan; Meisser, Nicolas (2026) Gritsenkoite, CoMg2(AsO4)2(H2O)8, a new cation-ordered arsenate member of the vivianite group from the Khovu-Aksy deposit, Eastern Siberia, Russia. American Mineralogist. doi:10.2138/am-2026-10402
Classification of Gritsenkoite
8.CE.40
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
E : With only medium-sized cations, RO4:H2O about 1:2.5
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Grk | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gritsenkoite
Vitreous
Transparency:
Transparent
Colour:
Reddish-pink
Streak:
White
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
perfect on {010}, good on {100}.
perfect on {010}, good on {100}.
Fracture:
Irregular/Uneven
Density:
2.88(2) g/cm3 (Measured) 2.8929 g/cm3 (Calculated)
Optical Data of Gritsenkoite
Type:
Biaxial (+)
RI values:
nα = 1.607(1) nβ = 1.617(1) nγ = 1.632(1)
2V:
Measured: 80.5° , Calculated: 79.1°
Max. Birefringence:
δ = 0.025
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
moderate r > v dispersion
Orientation:
X = b, Z ^ c ~ 33° in an obtuse angle.
Pleochroism:
Visible
Comments:
X∼Y
Chemistry of Gritsenkoite
Mindat Formula:
CoMg2(AsO4)2(H2O)8
Element Weights:
Crystallography of Gritsenkoite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 10.2594(4) Å, b = 13.4338(4) Å, c = 4.7528(4) Å
β = 105.166(7)°
β = 105.166(7)°
Ratio:
a:b:c = 0.764 : 1 : 0.354
Unit Cell V:
632.23 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.888 Å | (14) |
| 6.768 Å | (100) |
| 4.390 Å | (84) |
| 3.900 Å | (80) |
| 3.656 Å | (11) |
| 3.234 Å | (31) |
| 3.001 Å | (40) |
| 2.729 Å | (32) |
Reference:
Kasatkin, Anatoly V.; Plášil, Jakub; Škoda, Radek; Rohlíček, Jan; Agakhanov, Atali A.; Ansermet, Stefan; Meisser, Nicolas (2026) Gritsenkoite, CoMg2(AsO4)2(H2O)8, a new cation-ordered arsenate member of the vivianite group from the Khovu-Aksy deposit, Eastern Siberia, Russia. American Mineralogist. doi:10.2138/am-2026-10402
Comments:
a pseudo-Gandolfi powder diffraction pattern. The data were processed by the CrysAlis Pro software (Rigaku 2025).
Type Occurrence of Gritsenkoite
General Appearance of Type Material:
bladed crystals, up to 1 mm long, composing divergent groups
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Leninsky Pr. 18-2, 119071 Moscow, Russia, registration number 6272/1 (holotype) and 6272/2 (cotype)
Geological Setting of Type Material:
Oxidation zone of Russia's largest low-temperature hydrothermal deposit of the five-metal (Co-Ni-Ag-Bi-U) ore formation.
Associated Minerals at Type Locality:
Reference:
Kasatkin, Anatoly V.; Plášil, Jakub; Škoda, Radek; Rohlíček, Jan; Agakhanov, Atali A.; Ansermet, Stefan; Meisser, Nicolas (2026) Gritsenkoite, CoMg2(AsO4)2(H2O)8, a new cation-ordered arsenate member of the vivianite group from the Khovu-Aksy deposit, Eastern Siberia, Russia. American Mineralogist. doi:10.2138/am-2026-10402
Synonyms of Gritsenkoite
Other Language Names for Gritsenkoite
Dutch:Gritsenkoiet
Relationship of Gritsenkoite to other Species
Member of:
Other Members of Vivianite Group:
| Annabergite | Ni3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Arupite | Ni3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
| Babánekite | Cu3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Barićite | (Mg,Fe)3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
| Cabrerite | NiMg2(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Erythrite | Co3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Hörnesite | Mg3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Köttigite | Zn3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Manganohörnesite | Mn2+3(AsO4)2 · 8H2O | Mon. 2/m : P2/c |
| Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Pakhomovskyite | Co3(PO4)2 · 8H2O | Mon. 2/m : B2/m |
| Parasymplesite | Fe2+3(AsO4)2 · 8H2O | Mon. 2/m : B2/m |
| Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O | Mon. 2/m : B2/m |
| Zincocabrerite | ZnMg2(AsO4)2(H2O)8 | Mon. 2/m : B2/m |
Related Minerals - Strunz-mindat Grouping
| 8.CE. | Monteneroite | Cu2+Mn2+2(AsO4)2 · 8H2O |
| 8.CE. | Belmonteite | CaMn2(AsO4)2 · 7H2O |
| 8.CE. | Zincocabrerite | ZnMg2(AsO4)2(H2O)8 |
| 8.CE.X | Babánekite | Cu3(AsO4)2 · 8H2O |
| 8.CE.05 | Chudobaite | Mg5(AsO4)2(AsO3OH)2 · 10H2O |
| 8.CE.05 | Geigerite | Mn2+5(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.10 | Newberyite | Mg(PO3OH) · 3H2O |
| 8.CE.10 | Manganonewberyite | Mn(PO3OH)(H2O)3 |
| 8.CE.15 | Fanguangite | (MoO2)(PO3OH) · 4H2O |
| 8.CE.15 | Brassite | Mg(HAsO4) · 4H2O |
| 8.CE.20 | Phosphorrösslerite | Mg(PO3OH) · 7H2O |
| 8.CE.20 | Rösslerite | Mg(HAsO4) · 7H2O |
| 8.CE.25 | Switzerite | Mn2+3(PO4)2 · 7H2O |
| 8.CE.25 | Metaswitzerite | Mn2+3(PO4)2 · 4H2O |
| 8.CE.30 | Pradetite | CoCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Veselovskýite | ZnCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Lindackerite | CuCu4(AsO4)2(HAsO4)2 · 9H2O |
| 8.CE.30 | Klajite | MnCu4(AsO4)2(HAsO4)2 · 9-10H2O |
| 8.CE.30 | Hloušekite | (Ni,Co)Cu4(AsO4)2(AsO3OH)2 · 9H2O |
| 8.CE.30 | Ondrušite | CaCu4(AsO4)2(HAsO4)2 · 10H2O |
| 8.CE.35 | Bobierrite | Mg3(PO4)2 · 8H2O |
| 8.CE.40 | Barićite | (Mg,Fe)3(PO4)2 · 8H2O |
| 8.CE.40 | Parasymplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Cabrerite | NiMg2(AsO4)2 · 8H2O |
| 8.CE.40 | Pakhomovskyite | Co3(PO4)2 · 8H2O |
| 8.CE.40 | Vivianite | Fe2+Fe2+2(PO4)2 · 8H2O |
| 8.CE.40 | Arupite | Ni3(PO4)2 · 8H2O |
| 8.CE.40 | Erythrite | Co3(AsO4)2 · 8H2O |
| 8.CE.40 | Hörnesite | Mg3(AsO4)2 · 8H2O |
| 8.CE.40 | Manganohörnesite | Mn2+3(AsO4)2 · 8H2O |
| 8.CE.40 | Köttigite | Zn3(AsO4)2 · 8H2O |
| 8.CE.40 | Ferrisymplesite | Fe3+3(AsO4)2(OH)3 · 5H2O |
| 8.CE.40 | Annabergite | Ni3(AsO4)2 · 8H2O |
| 8.CE.45 | Symplesite | Fe2+3(AsO4)2 · 8H2O |
| 8.CE.50 | Cattiite | Mg3(PO4)2 · 22H2O |
| 8.CE.55 | Koninckite | Fe3+PO4 · 3H2O |
| 8.CE.60 | Kaňkite | FeAsO4 · 3.5H2O |
| 8.CE.60 | Hilarionite | Fe3+2(SO4)(AsO4)(OH) · 6H2O |
| 8.CE.65 | Steigerite | Al(VO4) · 3H2O |
| 8.CE.70 | Metaschoderite | Al2(PO4)(VO4) · 6H2O |
| 8.CE.70 | Schoderite | Al2(PO4)(VO4) · 8H2O |
| 8.CE.75 | Zigrasite | MgZr(PO4)2 · 4H2O |
| 8.CE.75 | 'UM2009-11-PO:CaHZr' | CaZr[PO4]2 · 4H2O |
| 8.CE.75 | Malhmoodite | FeZr(PO4)2 · 4H2O |
| 8.CE.80 | Santabarbaraite | Fe3+3(PO4)2(OH)3 · 5H2O |
| 8.CE.85 | Metaköttigite | (Zn,Fe,Fe)3(AsO4)2 · 8(H2O,OH) |
| 8.CE.90 | Slavkovite | Cu13(AsO4)6(AsO3OH)4 · 23H2O |
Fluorescence of Gritsenkoite
none
Other Information
Notes:
Gritsenkoite dissolves very slowly in dilute HCl and HNO3 at room temperature
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Gritsenkoite
mindat.org URL:
https://www.mindat.org/min-498749.html
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Please feel free to link to this page.
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References for Gritsenkoite
Reference List:
Rojo, 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)00088-8
Bosi, 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.2025.10183
Majzlan, Juraj; Többens, Daniel M; Lengauer, Christian (2026) Cation ordering in the annabergite-erythrite-hörnesite solid solutions. Mineralogy and Petrology, 120 (3). p.483-488. doi:10.1007/s00710-025-00963-9
Kasatkin, Anatoly V.; Plášil, Jakub; Škoda, Radek; Rohlíček, Jan; Agakhanov, Atali A.; Ansermet, Stefan; Meisser, Nicolas (2026) Gritsenkoite, CoMg2(AsO4)2(H2O)8, a new cation-ordered arsenate member of the vivianite group from the Khovu-Aksy deposit, Eastern Siberia, Russia. American Mineralogist. doi:10.2138/am-2026-10402
Localities for Gritsenkoite
Showing 3 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Morocco | |
| Kasatkin et al. (2026) |
| Kasatkin et al. (2026) |
Russia (TL) | |
| Bosi et al. (2025) |
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Oumlil Mine, Oumlil, Tansifte Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco