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Gerasimovskite Mineral Data

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General Gerasimovskite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Ca)(Nb,Ti)5O12•9(H2O) (?)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+0.8Ca0.2Nb2.5Ti2.5O12.3•9.1(H2O)
Help on Environment: Environment: Secondary mineral formed from late-stage hydrothermal alteration of Nb-Ti minerals.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1957
Help on Locality: Locality: Mts. Punkaruaiv, Karnasurt, Nepkhe, and Alluaiv, in the Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Vasily I. Gerasimovskii (1911-1979), Russian mineralogist and geochemist who discovered many new minerals at Lovozero.
Help on Name Pronunciation: Name Pronunciation: Gerasimovskite + Pronunciation Say GERASIMOVSKITE

Gerasimovskite Image

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  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

Help on Crystal System: Crystal System: Amorphous- No Crystals
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.89(1), 3.7(0.8), 3.18(0.6),2.1(0.4), 1.64(0.2),

Physical Properties of Gerasimovskite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Brown, Gray, Light gray.
Help on Density: Density: 2.52 - 2.58, Average = 2.54
Help on Diaphaneity: Diaphaneity: Translucent to Opaque
Help on Habit: Habit: Metamict - Mineral originally crystalline, now amorphous due to radiation damage.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Pearly

Optical Properties of Gerasimovskite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.3085,KC= 0.3097
Ncalc = 1.78 - 1.8
Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.47 gm/cc
note: Specific Gravity of Gerasimovskite =2.55 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEGerasimovskite = 48.51 barns/electron
U=PEGerasimovskite x rElectron Density= 120.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gerasimovskite is Not Radioactive

Gerasimovskite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.07)Dana Type
  (08.07.08)Belyankinite Group Belyankinite Ca1-2(Ti,Zr,Nb)5O12•9(H2O)(?) None Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12•9(H2O) None Gerasimovskite (Mn,Ca)(Nb,Ti)5O12•9(H2O)(?) None
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Print or Cut-and-Paste your Gerasimovskite Specimen Label here :


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





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