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Gerasimovskite Mineral Data
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General Gerasimovskite Information
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Chemical Formula: |
(Mn,Ca)(Nb,Ti)5O12•9(H2O) (?) |
Composition: |
Molecular Weight = 764.66 gm |
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Calcium 1.05 % Ca 1.47 % CaO |
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Titanium 15.65 % Ti 26.12 % TiO2 |
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Manganese 5.75 % Mn 7.42 % MnO |
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Niobium 30.37 % Nb 43.45 % Nb2O5 |
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Hydrogen 2.40 % H 21.44 % H2O |
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Oxygen 44.78 % O |
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______ ______ |
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100.00 % 99.90 % = TOTAL OXIDE |
Empirical Formula: |
Mn2+0.8Ca0.2Nb2.5Ti2.5O12.3•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 |
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Gerasimovskite Image |
Images:
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Gerasimovskite Crystallography
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Crystal System: |
Amorphous- No Crystals |
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), |
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Physical Properties of Gerasimovskite
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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 |
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Optical Properties of Gerasimovskite
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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. |
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Calculated Properties of Gerasimovskite
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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: |
PEGerasimovskite = 48.51 barns/electron U=PEGerasimovskite x rElectron Density= 120.01 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Gerasimovskite is Not Radioactive |
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Gerasimovskite Classification
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Dana Class: |
08.07.08.03 (08)Multiple Oxides with Nb, Ta, and Ti |
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(08.07)Dana Type |
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(08.07.08)Belyankinite Group |
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08.07.08.01 Belyankinite Ca1-2(Ti,Zr,Nb)5O12•9(H2O)(?) None |
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08.07.08.02 Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12•9(H2O) None |
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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 |
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04.F - Hydroxides (without V or U) |
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04.FM -Hydroxides with H2O � (OH); Unclassified |
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04.FM.25 Belyankinite Ca1-2(Ti,Zr,Nb)5O12•9(H2O)(?) None |
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04.FM.25 Gerasimovskite (Mn,Ca)(Nb,Ti)5O12•9(H2O)(?) None |
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04.FM.25 Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12•9(H2O) None |
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Other Gerasimovskite Information
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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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Print or Cut-and-Paste your Gerasimovskite Specimen Label here :
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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