Gerasimovskite (original) (raw)

A valid IMA mineral species - grandfathered

About GerasimovskiteHide

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Formula:

(Mn,Ca)(Nb,Ti)5O12 · 9H2O

Colour:

brown to gray or light gray

Specific Gravity:

2.52 - 2.58

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 IdentifiersHide

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Long-form identifier:

mindat:1:1:1678:6

743a44d5-0e98-45aa-926e-55c8cd683f64

IMA Classification of GerasimovskiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

IMA Formula:

Mn2+(Ti,Nb)5O12 · 9H2O (?)

Type description reference:

Classification of GerasimovskiteHide

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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

8.7.8.3

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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Physical Properties of GerasimovskiteHide

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Colour:

Brown to gray or light gray

Cleavage:

Perfect
In one direction

Density:

2.52 - 2.58 g/cm3 (Measured)

Optical Data of GerasimovskiteHide

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RI values:

_n_α = 1.740 _n_β = 1.810 _n_γ = 1.810

δ = 0.070

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

r > v moderate

Optical Extinction:

Parallel extinction, elongation positive.

Chemistry of GerasimovskiteHide

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Mindat Formula:

(Mn,Ca)(Nb,Ti)5O12 · 9H2O

Crystallography of GerasimovskiteHide

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Comment:

diffuse lines at 2.60, 1.85, and 1.64 A.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Lovozero massif, Russia. Data collected after heating the sample at 900°C.

Geological EnvironmentHide

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Type Occurrence of GerasimovskiteHide

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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 GerasimovskiteHide

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Other Language Names for GerasimovskiteHide

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Relationship of Gerasimovskite to other SpeciesHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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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 GerasimovskiteHide

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References for GerasimovskiteHide

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Localities for GerasimovskiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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