Gerasimovskite Mineral Data

General Gerasimovskite Information

Chemical Formula:

(Mn,Ca)(Nb,Ti)5O12•9(H2O) (?)

Composition:

Molecular Weight = 764.66 gm

Calcium 1.05 % Ca 1.47 % CaO

Titanium 15.65 % Ti 26.12 % TiO₂

Manganese 5.75 % Mn 7.42 % MnO

Niobium 30.37 % Nb 43.45 % Nb₂O₅

Hydrogen 2.40 % H 21.44 % H₂O

Oxygen 44.78 % O

______ ______

100.00 % 99.90 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_0.8Ca_0.2Nb_2.5Ti_2.5O_12.3•9.1(H₂O)

Environment:

Secondary mineral formed from late-stage hydrothermal alteration of Nb-Ti minerals.

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

Mts. Punkaruaiv, Karnasurt, Nepkhe, and Alluaiv, in the Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for Vasily I. Gerasimovskii (1911-1979), Russian mineralogist and geochemist who discovered many new minerals at Lovozero.

Name Pronunciation:

Gerasimovskite + Pronunciation

Gerasimovskite Image

Images:

Gerasimovskite Ussingite

Comments: Pale tan gerasimovskite pseudomorphous after epistolite crystal, in purple ussingite.
Location: Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Gerasimovskite Crystallography

Crystal System:

Amorphous- No Crystals

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.89(1), 3.7(0.8), 3.18(0.6),2.1(0.4), 1.64(0.2),

Physical Properties of Gerasimovskite

Cleavage:

{???} Perfect

Color:

Brown, Gray, Light gray.

Density:

2.52 - 2.58, Average = 2.54

Diaphaneity:

Translucent to Opaque

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2 - Gypsum

Luster:

Pearly

Optical Properties of Gerasimovskite

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.3085,KC= 0.3097
Ncalc = 1.78 - 1.8

Optical Data:

Biaxial (-), a=1.74, b=1.81, g=1.81, bire=0.0700, 2V(Calc)=0, 2V(Meas)=18.

Calculated Properties of Gerasimovskite

Electron Density:

Bulk Density (Electron Density)=2.47 gm/cc
note: Specific Gravity of Gerasimovskite =2.55 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Gerasimovskite}= 48.51 barns/electron
U=PE_{Gerasimovskite} x rElectron Density= 120.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gerasimovskite is Not Radioactive

Gerasimovskite Classification

Dana Class:

08.07.08.03 (08)Multiple Oxides with Nb, Ta, and Ti

(08.07)Dana Type

(08.07.08)Belyankinite Group

08.07.08.01 Belyankinite Ca1-2(Ti,Zr,Nb)5O12•9(H2O)(?) None

08.07.08.02 Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12•9(H2O) None

08.07.08.03 Gerasimovskite (Mn,Ca)(Nb,Ti)5O12•9(H2O)(?) None

Strunz Class:

04.FM.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FM -Hydroxides with H2O � (OH); Unclassified

04.FM.25 Belyankinite Ca1-2(Ti,Zr,Nb)5O12•9(H2O)(?) None

04.FM.25 Gerasimovskite (Mn,Ca)(Nb,Ti)5O12•9(H2O)(?) None

04.FM.25 Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12•9(H2O) None

Other Gerasimovskite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Gerasimovskite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Gerasimovskite

(Mn,Ca)(Nb,Ti)5O12•9(H2O) (?)
Dana No: 08.07.08.03 Strunz No: 04.FM.25
Locality:

Notes:

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