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 % Na₂O

Titanium 9.27 % Ti 15.47 % TiO₂

Iron 3.61 % Fe 5.16 % Fe₂O₃

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:

Na₂Ti_0.75Fe³⁺_0.25Si₄O₁₀F

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

Comments: Narsarsukite crystal in matrix.
Location: Mont Saint-Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

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

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

By Intensity(I/I_o): 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:

PE_Narsarsukite= 3.91 barns/electron
U=PE_Narsarsukite x rElectron 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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