Narsarsukite Mineral Data

Narsarsukite Mineral Data +

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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.

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 - DipyramidalH-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),

Crystal Structure:

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Peacor D R , Buerger M J , American Mineralogist , 47 (1962) p.539-556, The determination and refinement of the structure of narsarsukite, Na2TiOSi4O10

Physical Properties of Narsarsukite

Cleavage:

[???] Good, [???] Good

Color:

Brown, Brownish gray, Colorless, Green, Honey yellow.

Density:

2.7

Diaphaniety:

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

Optical Data:

Uniaxial (+), w=1.609, e=1.63, bire=0.0210.

Calculated Properties of Narsarsukite

Electron Density:

r_electron=2.65 gm/cc
note: r_Narsarsukite=2.70 gm/cc.

Fermion Index

Fermion Index = 0.0265
Boson Index = 0.9735

Photoelectric:

PE_Narsarsukite= 3.91 barns/electron
U=PE_Narsarsukite x r_electron= 10.35 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Narsarsukite is Not Radioactive

Narsarsukite Classification

Dana Class:

70.1.2.1 (70)Inosilicate Column or Tube Structures

(70.1)with columnar silicate units

(70.1.2)Double crankshaft chains

70.1.2.1 Narsarsukite Na2(Ti,Fe)Si4(O,F)11 I 4/m 4/m

70.1.2.2 Caysichite-(Y) Y2(Ca,Gd)2Si4O10(CO3)3(H2O,O,OH)·3H20 Ccm21 mm2

70.1.2.3 Charoite K5Ca8(Si6O15)2(Si2O7)Si4O9(OH)·3(H2O) P*/4 ((pseudo Ortho) 2/m

Strunz Class:

VIII/F.34-10 VIII - Silicates

VIII/F - Inosilicates (chain and band) complex chain structure. Cylindric chains and others

VIII/F.34 - Grumantite - Penkvilksite series

VIII/F.34-10 Narsarsukite Na2(Ti,Fe)Si4(O,F)11 I 4/m 4/m

VIII/F.34-20 Vlasovite Na2ZrSi4O11 C 2/c 2/m

VIII/F.34-30 Penkvilksite Na4(Ti,Zr)2[Si8O22]·4(H2O) P 2₁/c 2/m

VIII/F.34-40 Tumchaite! Na2(Zr,Sn)Si4O11·2(H2O) P 2₁/c 2/m

Other Narsarsukite Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Narsarsukite

Na2(Ti,Fe+++)Si4(O,F)11
Dana No: 70.1.2.1 Strunz No: VIII/F.34-10
Locality:

Notes: