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Fersmanite Mineral Data

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General Fersmanite Information

Help on Chemical  Formula: Chemical Formula: Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3
Help on Composition: Composition: Molecular Weight = 1,061.05 gm
   Sodium      5.63 %  Na    7.59 % Na2O
   Strontium   0.83 %  Sr    0.98 % SrO
   Calcium    20.02 %  Ca   28.01 % CaO
   Titanium   10.38 %  Ti   17.32 % TiO2
   Niobium    14.01 %  Nb   20.04 % Nb2O5
   Silicon    10.59 %  Si   22.65 % SiO2
   Oxygen     33.17 %  O
   Fluorine    5.37 %  F     5.37 % F
                -   %   F    -2.26 % -O=F2    
             ______        ______ 
             100.00 %       99.70 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca5.3Na2.6Sr0.1Ti2.3Nb1.6Si4O22F3
Help on Environment: Environment: Associated with feldspar and aegirite in veins in nepheline-syenite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1929
Help on Locality: Locality: Chibines Mountains, Kola peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alexander Yevgenievich Fersman (1883-1945), Russian mineralogist and geochemist.
Help on Name Pronunciation: Name Pronunciation: Fersmanite + Pronunciation Say FERSMANITE
Help on Synonym: Synonym: ICSD 20821
  PDF 29-1446
 

Fersmanite Image

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  Fersmanite

Comments: Large single crystal of brown fersmanite in quartz matrix.
Location: Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: 4x3x2 cm.
© John Betts - Fine Minerals

Fersmanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1:1:2.0029
Help on Cell Dimensions: Cell Dimensions: a = 10.183, b = 10.183, c = 20.396, Z = 4; beta = 97.19° V = 2,098.30 Den(Calc)= 3.36
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.058(1), 2.815(0.62), 1.518(0.55),
 

Physical Properties of Fersmanite

Help on Cleavage: Cleavage: None
Help on Color: Color: Golden yellow, Resin brown, Light brown, Dark brown.
Help on Density: Density: 3.44
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Pseudo Tetragonal - Crystals show a tetragonal shape.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brownish white
 

Optical Properties of Fersmanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.074 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.1 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2706,KPDmeas= 0.2643,KC= 0.2461
Ncalc = 1.83 - 1.85
Help on Optical Data: Optical Data: Biaxial (-), a=1.873-1.886, b=1.914-1.93, g=1.914-1.939, bire=0.0410-0.0530, 2V(Calc)=0-46, 2V(Meas)=0-7.
 

Calculated Properties of Fersmanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.33 gm/cc
note: Specific Gravity of Fersmanite =3.44 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFersmanite = 26.13 barns/electron
U=PEFersmanite x rElectron Density= 87.01 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Fersmanite is Not Radioactive
 

Fersmanite Classification

Help on  Dana Class: Dana Class: 56.02.05.03 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.05)Mosandrite and related species
 
56.02.05.01 Mosandrite Na(Na,Ca)2(Ca,Ce,Y)4(Ti,Nb,Zr)(Si2O7)2(O,F)2F3 P 21 2
 
56.02.05.02 Nacareniobsite-(Ce) NbNa3Ca3(Ce,La)(Si2O7)2OF3 P 21/a 2/m
 
56.02.05.03 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m
 
56.02.05.04 Gotzenite (Ca,Na)3(Ti,Al)Si2O7(F,OH)2 P1 1
 
56.02.05.05 Rinkite! Na(Na,Ca)2(Ca,Ce)4(Ti,Nb)(Si2O7)2(O,F)2 P 21 2
 
56.02.05.06 IMA2008-024! (Ca,Na,REE,[])7(Nb,Ti)[Si2O7]2OF3 Cc m
 
56.02.05.07 Dovyrenite! Ca6Zr[Si2O7]2(OH)4 Pnnm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BE.72 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
 
09.BE.72 Fersmanite Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3 C 2/c 2/m
 

Other Fersmanite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Dana8, AmMin, v 88, p 1179) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Fersmanite :
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
15 - WWW-MINCRYST

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Fersmanite

Ca4(Na,Ca)4(Ti,Nb)4(Si2O7)2O8F3
Dana No: 56.02.05.03 Strunz No: 09.BE.72
Locality:

 

Notes:

 

 
   
 


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