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Nafertisite Mineral Data

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General Nafertisite Information

Help on Chemical  Formula: Chemical Formula: Na3(Fe++,Fe+++)6(Ti2Si12O34)(O,OH)7•2(H2O)
Help on Composition: Composition: Molecular Weight = 1,530.61 gm
   Sodium     4.51 %  Na    6.07 % Na2O
   Titanium   6.26 %  Ti   10.44 % TiO2
   Iron      21.89 %  Fe   21.12 % FeO /  7.82 % Fe2O3
   Silicon   22.02 %  Si   47.11 % SiO2
   Hydrogen   0.38 %  H     3.38 % H2O
   Oxygen    44.95 %  O
            ______        ______ 
            100.00 %       95.95 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3Fe2+4.5Fe3+1.5Ti2Si12O39.25(OH)1.75�2(H2O)
Help on IMA Status: IMA Status: Approved IMA 1995 (Dana # Added)
Help on Locality: Locality: Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the elements, NAtrium, FERrus and FERric, and TIanium.
Help on Name Pronunciation: Name Pronunciation: Nafertisite + Pronunciation Say NAFERTISITE
Help on Synonym: Synonym: ICSD 82768
  PDF 49-1819

Nafertisite Image

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Comments: Dark green fibrous nafertisite masses in pegmatite rock.
Location: Mount Kukisvumchorr, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Nafertisite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3309:1:1.3569
Help on Cell Dimensions: Cell Dimensions: a = 5.353, b = 16.176, c = 21.95, Z = 2; beta = 94.6° V = 1,894.53 Den(Calc)= 2.68
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10.94(1), 13(0.3), 2.728(0.25),

Physical Properties of Nafertisite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Green, Dark grass green.
Help on Density: Density: 2.7
Help on Diaphaneity: Diaphaneity: Transparent
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Nafertisite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.084 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2471,KPDmeas= 0.2453,KC= 0.2264
Ncalc = 1.61
Help on Optical Data: Optical Data: Biaxial (-), a=1.627, b=1.667, g=1.693, bire=0.0660, 2V(Calc)=76, 2V(Meas)=75-76.

Calculated Properties of Nafertisite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Nafertisite =2.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PENafertisite = 8.46 barns/electron
U=PENafertisite x rElectron Density= 22.41 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nafertisite is Not Radioactive

Nafertisite Classification

Help on  Dana Class: Dana Class: 56.02.06b.03 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.06b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)
56.02.06b.01 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m
56.02.06b.02 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 21/m 2/m
56.02.06b.03 Nafertisite! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7•2(H2O) A2/m 2/m
56.02.06b.04 Surkhobite! KBa3Ca2Na2(Mn,Fe,Fe)16Ti8(Si2O7)8O8(OH)4(F,O,OH)8 C 2 2
56.02.06b.05 Nechelyustovite! (Ba,Na)2{(Na,Ti,Mn)4[(Ti,Nb)2O2Si4O14](OH,O,F)2}•4.5H2O P 2/m 2/m
56.02.06b.06 Caryochroite! (Na,Sr)3(Fe,Mg)10[Ti2Si12O37](O,OH)9•8H2O P 2/n (?) 2/m
Help on  Strunz Class: Strunz Class: 09.EH.30 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EH -Transitional structures between phyllosilicate and other silicate units
09.EH.30 Nafertisite! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7•2(H2O) A2/m 2/m

Other Nafertisite Information

Help on References: References: PHYS. PROP.(Eur. J. Min.,Vol.8,p241-249,1996) OPTIC PROP.(Eur. J. Min.,Vol.8,p241-249,1996)
Help on See Also: See Also: Links to other databases for Nafertisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 56.02.06b.03 Strunz No: 09.EH.30





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