Nafertisite Mineral Data

General Nafertisite Information

Chemical Formula:

Na3(Fe++,Fe+++)6(Ti2Si12O34)(O,OH)7•2(H2O)

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

Empirical Formula:

Na₃Fe²⁺_4.5Fe³⁺_1.5Ti₂Si₁₂O_39.25(OH)_1.75ï¿½2(H₂O)

IMA Status:

Approved IMA 1995 (Dana # Added)

Locality:

Link to MinDat.org Location Data.

Name Origin:

Named for the elements, NAtrium, FERrus and FERric, and TIanium.

Name Pronunciation:

Nafertisite + Pronunciation

Synonym:

ICSD 82768

IMA1994-007

PDF 49-1819

Nafertisite Image

Images:

Nafertisite

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

Axial Ratios:

a:b:c =0.3309:1:1.3569

Cell Dimensions:

a = 5.353, b = 16.176, c = 21.95, Z = 2; beta = 94.6° V = 1,894.53 Den(Calc)= 2.68

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 10.94(1), 13(0.3), 2.728(0.25),

Physical Properties of Nafertisite

Cleavage:

{001} Perfect

Color:

Green, Dark grass green.

Density:

2.7

Diaphaneity:

Transparent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Nafertisite

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

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

Electron Density:

Bulk Density (Electron Density)=2.65 gm/cc
note: Specific Gravity of Nafertisite =2.70 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Nafertisite= 8.46 barns/electron
U=PE_Nafertisite x rElectron Density= 22.41 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nafertisite is Not Radioactive

Nafertisite Classification

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

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

References:

PHYS. PROP.(Eur. J. Min.,Vol.8,p241-249,1996) OPTIC PROP.(Eur. J. Min.,Vol.8,p241-249,1996)

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
11 - WWW-MINCRYST

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Nafertisite

Na3(Fe++,Fe+++)6(Ti2Si12O34)(O,OH)7•2(H2O)
Dana No: 56.02.06b.03 Strunz No: 09.EH.30
Locality:

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