Nafertisite Mineral Data

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)_1.75·2(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.

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 - PrismaticH-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),

Crystal Structure:

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Ferraris G , Ivaldi G , Khomyakov A P , Soboleva S V , Belluso E , Pavese A , European Journal of Mineralogy , 8 (1996) p.241-249, Nafertisite, a layer titanosilicate member of a polysomatic series including mica

Physical Properties of Nafertisite

Cleavage:

[001] Perfect

Color:

Green, Dark grass green.

Density:

2.7

Diaphaniety:

Transparent

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Nafertisite

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:

r_electron=2.63 gm/cc
note: r_Nafertisite=2.68 gm/cc.

Fermion Index

Fermion Index = 0.02322
Boson Index = 0.97678

Photoelectric:

PE_Nafertisite= 8.46 barns/electron
U=PE_Nafertisite x r_electron= 22.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nafertisite is Not Radioactive

Nafertisite Classification

Dana Class:

56.2.6b.3 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.6b)Seidozerite - Lamprophyllite group (Bafertisite subgroup)

56.2.6b.1 Bafertisite Ba(Fe,Mn)2TiSi2O7(O,OH)2 Cm m

56.2.6b.2 Hejtmanite Ba(Mn,Fe)2TiO(Si2O7)(OH,F)2 P 2₁/m 2/m

56.2.6b.3 Nafertisite ! Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7·2(H2O) A2/m 2/m

56.2.6b.4 Surkhobite! (Ca,Na)(Ba,K)(Fe,Mn)4Ti2(Si4O14)O2(F,OH,O)3 C 2 2

Strunz Class:

VIII/G.13-10 VIII - Silicates

VIII/G - Intermediate between chain- and layered silicates

VIII/G.13 - Haradaite - Suzukiite series

VIII/G.13-10 Nafertisite Na3(Fe,Fe)6(Ti2Si12O34)(O,OH)7·2(H2O) A2/m 2/m

VIII/G.13-20 Zeravshanite! Cs4Na2Zr3(Si18O45)(H2O)2 C 2/c 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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas 10 - WWW-MINCRYST

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Print or Cut-and-Paste your Nafertisite Specimen Label here :

Nafertisite

Na3(Fe++,Fe+++)6(Ti2Si12O34)(O,OH)7·2(H2O)
Dana No: 56.2.6b.3 Strunz No: VIII/G.13-10
Locality:

Notes: