Narsarsukite Mineral Data
General Narsarsukite Information
Chemical Formula:
Na2(Ti,Fe+++)Si4(O,F)11
Composition:
Molecular Weight = 387.19 gm
Sodium 11.88 % Na 16.01 % Na2 O
Titanium 9.27 % Ti 15.47 % TiO2
Iron 3.61 % Fe 5.16 % Fe2 O3
Silicon 29.02 % Si 62.07 % SiO2
Oxygen 41.32 % O
Fluorine 4.91 % F 4.91 % F
- %
F -2.07 % -O=F2
______ ______
100.00 % 101.55 % = TOTAL OXIDE
Empirical Formula:
Na2 Ti0.75 Fe3+ 0.25 Si4 O10 F
Environment:
Pegmatite dikes.
IMA Status:
Approved IMA 1990
Locality:
Narsarsuk, southern Greenland. Link to MinDat.org Location Data.
Name Origin:
Named after its locality.
Name Pronunciation:
Narsarsukite + Pronunciation
Synonym:
ICSD 16899
PDF 11-478
Narsarsukite Image
Images:
Narsarsukite Crystallography
Axial Ratios:
a:c = 1:0.73556
Cell Dimensions:
a = 10.74, c = 7.9, Z = 4; V = 911.25 Den(Calc)= 2.82
Crystal System:
Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 4/m
X Ray Diffraction:
By Intensity(I/Io ): 5.37(1), 3.26(0.8), 3.394(0.8),
Physical Properties of Narsarsukite
Cleavage:
{???} Good, {???} Good
Color:
Brown, Brownish gray, Colorless, Green, Honey yellow.
Density:
2.7
Diaphaneity:
Transparent to translucent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
7 - Quartz
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Narsarsukite
Gladstone-Dale:
CI meas = 0.04 (Good) - where the CI = (1-KPDmeas /KC ) CI calc = 0.08 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2197,KPDmeas = 0.2294,KC = 0.2389 Ncalc = 1.64 - 1.67
Optical Data:
Uniaxial (+), w=1.609, e=1.63, bire=0.0210.
Calculated Properties of Narsarsukite
Electron Density:
Bulk Density (Electron Density)=2.65 gm/cc note: Specific Gravity of Narsarsukite =2.70 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PENarsarsukite = 3.91 barns/electronU=PENarsarsukite x r Electron Density= 10.35 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Narsarsukite is Not Radioactive
Narsarsukite Classification
Dana Class:
70.01.02.01 (70) Inosilicate Column or Tube Structures
(70.01) with columnar silicate units
(70.01.02) Double crankshaft chains
70.01.02.01 Narsarsukite Na2(Ti,Fe)Si4(O,F)11 I 4/m 4/m
70.01.02.02 Caysichite-(Y) Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)•3H20 Ccm21 mm2
70.01.02.03 Charoite K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)•3(H2O) P*/4 ((pseudo Ortho) 2/m
Strunz Class:
09.DJ.05 09 - SILICATES (Germanates)
09.D - Inosilicates* Structural terminology according to Liebau (1985)
09.DJ -Inosilicates with 4-periodic double and triple chains
09.DJ.05 Narsarsukite Na2(Ti,Fe)Si4(O,F)11 I 4/m 4/m
Other Narsarsukite Information
References:
NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Narsarsukite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (MinSocAm)
12 - Handbook of Mineralogy (UofA)
13 - MinDAT
14 - Mineralienatlas (Deutsch)
15 - Online Mineral Museum
16 - QUT Mineral Atlas
17 - Ruff.Info
18 - WWW-MINCRYST
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Narsarsukite
Na2(Ti,Fe+++)Si4(O,F)11
Dana No: 70.01.02.01 Strunz No: 09.DJ.05
Locality:
Notes:
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