Gerasimovskite Mineral Data

Gerasimovskite Mineral Data +

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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.

Gerasimovskite Image

Images:

Click Here for Larger Gerasimovskite Image

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

Diaphaniety:

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

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:

r_electron=2.47 gm/cc
note: r_{Gerasimovskite}=2.55 gm/cc.

Fermion Index

Fermion Index = 0.02047
Boson Index = 0.97953

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gerasimovskite is Not Radioactive

Gerasimovskite Classification

Dana Class:

8.7.8.3 (8)Multiple Oxides with Nb, Ta, and Ti

(8.7)Dana Type

(8.7.8)Dana Group

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

8.7.8.2 Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12·9(H2O) None

8.7.8.3 Gerasimovskite (Mn,Ca)(Nb,Ti)5O12·9(H2O)(?) None

Strunz Class:

IV/D.06-30 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.06 - Belyankinite - Hochelagaite series

IV/D.06-10 Belyankinite Ca1-2(Ti,Zr,Nb)5O12·9(H2O)(?) None

IV/D.06-20 Manganbelyankinite (Mn,Ca)(Ti,Nb)5O12·9(H2O) None

IV/D.06-30 Gerasimovskite (Mn,Ca)(Nb,Ti)5O12·9(H2O)(?) None

IV/D.06-35 Ternovite! (Mg,Ca)Nb4O11-n(H2O)wheren~10 P 2/m,P 2,Pm Mono

IV/D.06-40 Franconite Na2Nb4O11·9(H2O) Unk Mono

IV/D.06-50 Hochelagaite (Ca,Na,Sr)Nb4O11·8(H2O) Unk Mono

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Gerasimovskite

(Mn,Ca)(Nb,Ti)5O12·9(H2O) (?)
Dana No: 8.7.8.3 Strunz No: IV/D.06-30
Locality:

Notes: