Natisite Mineral Data

General Natisite Information

Chemical Formula:

Na2(TiO)SiO4

Composition:

Molecular Weight = 201.94 gm

Sodium 22.77 % Na 30.69 % Na₂O

Titanium 23.71 % Ti 39.56 % TiO₂

Silicon 13.91 % Si 29.75 % SiO₂

Oxygen 39.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂TiSiO₅

Environment:

In natrolite-ussingite veins cutting alkalic rocks in a differentiated alkalic massif.

IMA Status:

Approved IMA 1975

Locality:

Mt. Karnasurt, Lovozero massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for the sodium, NAtrium, TItanium, and SIlicon in the composition.

Name Pronunciation:

Natisite

Synonym:

ICSD 1533

PDF 29-1279

Natisite Image

Images:

Natisite

Comments: Yellow-greenish crystals of natisite in matrix.
Location: Mt. Karnasurt, Lovozero, Kola, Russia. Scale: Picture size 1 cm.
© Diederik Visser

Natisite Crystallography

Axial Ratios:

a:c = 1:0.78

Cell Dimensions:

a = 6.5, c = 5.07, Z = 2; V = 214.21 Den(Calc)= 3.13

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm

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

By Intensity(I/I_o): 2.709(1), 5.05(0.8), 1.689(0.7),

Physical Properties of Natisite

Cleavage:

{001} Perfect, {100} Good

Color:

Greenish gray, Yellow green.

Density:

3.15

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Natisite

Gladstone-Dale:

CI meas= 0.173 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.168 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2294,KPDmeas= 0.2279,KC= 0.2757
Ncalc = 1.86 - 1.87

Optical Data:

Uniaxial (-), e=1.68, w=1.756, bire=0.0760.

Calculated Properties of Natisite

Electron Density:

Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Natisite =3.13 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Natisite= 4.79 barns/electron
U=PE_Natisite x rElectron Density= 14.56 barns/cc.

Radioactivity:

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

Natisite Classification

Dana Class:

52.04.04.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.04)with cations in [6] and/or > [6] coordination

(52.04.04)Natisite - Yftisite group

52.04.04.01 Natisite Na2(TiO)SiO4 P 4/nmm 4/m 2/m 2/m

52.04.04.02 Paranatisite Na2[TiO(SiO4)] P mc2₁ mm2

52.04.04.03 Yftisite-(Y)? (Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6 C mcm 2/m 2/m 2/m

Strunz Class:

09.AG.40a 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AG -Nesosilicates with additional anions; cations in > [6] ï¿½ [6] coordination

09.AG.40a Natisite Na2(TiO)SiO4 P 4/nmm 4/m 2/m 2/m

Other Natisite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Natisite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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

Natisite

Na2(TiO)SiO4
Dana No: 52.04.04.01 Strunz No: 09.AG.40a
Locality:

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