Gerasimovskite
A valid IMA mineral species - grandfathered
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About Gerasimovskite
Formula:
(Mn,Ca)(Nb,Ti)5O12 · 9H2O
Colour:
brown to gray or light gray
Lustre:
Pearly
Hardness:
2
Specific Gravity:
2.52 - 2.58
Crystal System:
Amorphous
Name:
Named in 1957 by Evgeny Ivanovich Semenov in honor of Vasilii Ivanovich Gerasimovsky (Василий Иванович Герасимовский) (20 June 1907, village of Artemyevskaya, Vologda province - 11 August 1979, Transbaikalia) in 1934, discovered (together with O.A. Vorobyova) industrial deposits of loparite ore on the Kola Peninsula.
This page provides mineralogical data about Gerasimovskite.
Unique Identifiers
Mindat ID:
1678
Long-form identifier:
mindat:1:1:1678:6
GUID
(UUID V4):
(UUID V4):
743a44d5-0e98-45aa-926e-55c8cd683f64
IMA Classification of Gerasimovskite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
Mn2+(Ti,Nb)5O12 · 9H2O (?)
First published:
1957
Classification of Gerasimovskite
4.FM.25
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
M : Hydroxides with H2O +- (OH); unclassified
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
M : Hydroxides with H2O +- (OH); unclassified
8.7.8.3
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
7 : Miscellaneous
18.1.37
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U
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 |
---|---|---|
Gms | 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 Gerasimovskite
Pearly
Colour:
brown to gray or light gray
Hardness:
2 on Mohs scale
Cleavage:
Perfect
In one direction
In one direction
Density:
2.52 - 2.58 g/cm3 (Measured)
Optical Data of Gerasimovskite
Type:
Biaxial (-)
RI values:
nα = 1.740 nβ = 1.810 nγ = 1.810
2V:
Measured: 18°
Max Birefringence:
δ = 0.070
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
r > v moderate
Optical Extinction:
Parallel extinction, elongation positive.
Chemistry of Gerasimovskite
Mindat Formula:
(Mn,Ca)(Nb,Ti)5O12 · 9H2O
Crystallography of Gerasimovskite
Crystal System:
Amorphous
Comment:
diffuse lines at 2.60, 1.85, and 1.64 A.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
1.89 Å | (100) |
3.70 Å | (80) |
3.18 Å | (60) |
2.10 Å | (40) |
1.64 Å | (20) |
Comments:
Lovozero massif, Russia. Data collected after heating the sample at 900°C.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Gerasimovskite
General Appearance of Type Material:
Platy masses up to 1.5x1x0.3 cm.
Geological Setting of Type Material:
In ussingite-bearing pegmatites. Thought to have formed by the hydrothermal alteration of minerals of the murmanite-lomonosovite series.
Reference:
Semenov, E.I. (1957) Oxides and hydroxides of titanium and niobium in the Lovozero alkalic massif. Institute of Mineralogy, Geochemistry, Crystal Chemistry and Trace Elements, Akademiya Nauk CCCP, Trudy: 1: 41-59.
Synonyms of Gerasimovskite
Other Language Names for Gerasimovskite
Relationship of Gerasimovskite to other Species
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
4 photos of Gerasimovskite associated with Ussingite | Na2AlSi3O8OH |
3 photos of Gerasimovskite associated with Aegirine | NaFe3+Si2O6 |
2 photos of Gerasimovskite associated with Birnessite | (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O |
1 photo of Gerasimovskite associated with Pectolite | NaCa2Si3O8(OH) |
1 photo of Gerasimovskite associated with Manganonordite-(Ce) | Na3SrCeMn2+Si6O17 |
1 photo of Gerasimovskite associated with Albite | Na(AlSi3O8) |
Related Minerals - Strunz-mindat Grouping
4.FM. | Charleshatchettite | CaNb4O10(OH)2 · 8H2O |
4.FM. | Dinilawiite | [Pb4O2Al(OH)5]2(S2O3)2 · H2(S2O3)(H2O)5 |
4.FM. | Yttrotungstite-(Nd) | NdW2O7(OH) · H2O |
4.FM.15 | Franconite | Na(Nb2O5)(OH) · 3H2O |
4.FM.15 | Hochelagaite | (Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2O |
4.FM.15 | Ternovite | (Mg,Ca)Nb4O11 · nH2O |
4.FM.25 | Belyankinite | Ca1-2(Ti,Nb)5O12 · 9H2O (?) |
4.FM.25 | Manganbelyankinite | (Mn,Ca)(Ti,Nb)5O12 · 9H2O |
4.FM.30 | Silhydrite | Si3O6 · H2O |
4.FM.35 | Cuzticite | Fe3+2(TeO6) · 3H2O |
4.FM.50 | Qatranaite | CaZn2(OH)6(H2O)2 |
4.FM.55 | Hydroplumbite | 3PbO · H2O |
Other Information
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 Gerasimovskite
mindat.org URL:
https://www.mindat.org/min-1678.html
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Please feel free to link to this page.
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References for Gerasimovskite
Reference List:
Localities for Gerasimovskite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Greenland | |
| [Mineralogical Record - Vol 24 No 2] +1 other reference |
Russia | |
| ... |
| Pekov (1998) |
| Pekov (2000) |
Arzamastsev et al. (2008) | |
Pekov (2000) | |
| Pekov (1998) |
Trud.Inst.min.geokh.cryst. redkikh elementov (1957) +3 other references | |
Pekov et al. (2013) | |
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Pegmatite No. 60, Second Eastern Stream, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia