Sergeevite
A valid IMA mineral species
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About Sergeevite
Formula:
Ca2Mg11(CO3)9(HCO3)4(OH)4 · 6H2O
Colour:
White
Lustre:
Dull
Hardness:
3½
Specific Gravity:
2.55 - 2.87
Crystal System:
Trigonal
Name:
Named after Evgeneii Mikhailovich Sergeev (1924–1997), geological engineer, Moscow University, Moscow, Russia.
This page provides mineralogical data about Sergeevite.
Unique Identifiers
Mindat ID:
3624
Long-form identifier:
mindat:1:1:3624:1
IMA Classification of Sergeevite
Approved
First published:
1980
Classification of Sergeevite
5.DB.25
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
13.1.7.1
13 : ACID CARBONATES
1 : Miscellaneous
13 : ACID CARBONATES
1 : Miscellaneous
11.4.8
11 : Carbonates
4 : Carbonates of Ca
11 : Carbonates
4 : Carbonates of Ca
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 |
|---|---|---|
| Sge | 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 Sergeevite
Dull
Colour:
White
Hardness:
3½ on Mohs scale
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.55 - 2.87 g/cm3 (Measured) 2.64 g/cm3 (Calculated)
Optical Data of Sergeevite
Type:
Uniaxial
RI values:
nα = 1.571 nβ = 1.581
Max. Birefringence:
δ = 0.000
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.
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.
Surface Relief:
Moderate
Chemistry of Sergeevite
Mindat Formula:
Ca2Mg11(CO3)9(HCO3)4(OH)4 · 6H2O
Element Weights:
Crystallography of Sergeevite
Crystal System:
Trigonal
Cell Parameters:
a = 19.01 Å, c = 7.82 Å
Ratio:
a:c = 1 : 0.411
Unit Cell V:
2,447.38 ų (Calculated from Unit Cell)
Z:
3
Comment:
Questionable
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.821 Å | (100) |
| 7.14 Å | (30) |
| 3.58 Å | (30) |
| 2.87 Å | (30) |
| 1.965 Å | (27) |
| 1.755 Å | (20) |
| 3.37 Å | (15) |
Comments:
Malyi Mukulan Sn mine, Russia. The data are from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Sergeevite
General Appearance of Type Material:
Rhombohedral crystals, to 0.5 µm, in globular concretions and irregular veinlets.
Place of Conservation of Type Material:
Mining Institute, St. Petersburg, 1262/1; A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 80181, 82947.
Geological Setting of Type Material:
Weathering product of pyroxene/garnet skarn.
Associated Minerals at Type Locality:
Synonyms of Sergeevite
Other Language Names for Sergeevite
Related Minerals - Strunz-mindat Grouping
| 5.DB. | Rigrahamite | Na2Ca2Th2(CO3)4(HCO3)2(OH)4(H2O)7 |
| 5.DB. | Grguricite | CaCr2(CO3)2(OH)4 · 4H2O |
| 5.DB.05 | Para-alumohydrocalcite | CaAl2(CO3)2(OH)4 · 6H2O |
| 5.DB.05 | Nasledovite | PbMn3Al4(CO3)4(SO4)O5 · 5H2O |
| 5.DB.05 | 'UM1977-02-CO:AlCaH' | Ca6Al2(CO3)3O6 · 32H2O |
| 5.DB.05 | Alumohydrocalcite | CaAl2(CO3)2(OH)4 · 4H2O |
| 5.DB.10 | Kochsándorite | CaAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Dresserite | BaAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Dundasite | PbAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | 'Unnamed (Ca-analogue of Petterdite)' | CaCr3+2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Petterdite | PbCr3+2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Strontiodresserite | SrAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Montroyalite | Sr4Al8(CO3)3(OH,F)26 · 10-11H2O |
| 5.DB.15 | Hydrodresserite | BaAl2(CO3)2(OH)4 · 3H2O |
| 5.DB.20 | Schuilingite-(Nd) | PbCu(Nd,Gd,Sm,Y)(CO3)3(OH) · 1.5H2O |
| 5.DB.30 | Szymańskiite | [H3O]+8[Hg2]2+8(Ni,Mg)6[CO3]12(OH)12 · 3H2O |
| 5.DB.35 | Lusernaite-(Y) | Y4Al(CO3)2(OH)10F · 6H2O |
| 5.DB.40 | Putnisite | SrCa4Cr3+8(CO3)8SO4(OH)16 · 23H2O |
Other Information
Thermal Behaviour:
DTA curve shows three endothermic breaks at 1200, 5800, and 800°C, corresponding to losses in weight of 13%, 37%, and 6%.
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 Sergeevite
mindat.org URL:
https://www.mindat.org/min-3624.html
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References for Sergeevite
Localities for Sergeevite
Showing 2 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.
Russia | |
| ZVMO 109 (1980) +1 other reference |
| Yakhontova et al. (1980) +1 other reference |
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Tyrnyauz Mo-W deposit, Tyrnyauz Urban Settlement, Elbrussky District, Kabardino-Balkaria, Russia