Lueshite Mineral Data

General Lueshite Information

Chemical Formula:

NaNbO3

Composition:

Molecular Weight = 163.89 gm

Sodium 14.03 % Na 18.91 % Na₂O

Niobium 56.69 % Nb 81.09 % Nb₂O₅

Oxygen 29.29 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

NaNbO₃

IMA Status:

Approved IMA 1959

Locality:

Lueshe, Goma, Congo, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Lueshite

Synonym:

ICSD 39624

PDF 33-1270

Lueshite Image

Images:

Lueshite

Comments: Opaque, brownish, pseudo-cubic crystals of lueshite.
Location: Republic of Congo. Scale: Crystal size 8 mm.
© John Attard

Lueshite Crystallography

Axial Ratios:

a:b:c =0.9963:1:2.8028

Cell Dimensions:

a = 5.51, b = 5.53, c = 15.5, Z = 8; V = 472.29 Den(Calc)= 4.61

Crystal System:

Orthorhombic - DisphenoidalH-M Symbol (2 2 2) Space Group: P 222₁

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

By Intensity(I/I_o): 2.76(1), 3.9(0.85), 1.95(0.7),

Crystal Structure:

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von der Muhll R , Sadel A , Hagenmuller P , Journal of Solid State Chemistry , 51 (1984) p.176-182, Structure cristalline a 295K de la phase ferroelectrique Li0.02Na0.98Nb O3, Locality: synthetic, Note: x(O3) corrected to match reported bond lengths

Physical Properties of Lueshite

Cleavage:

{001} Indistinct

Color:

Black, Brown.

Density:

4.44

Diaphaneity:

Translucent to Opaque

Hardness:

5.5 - Knife Blade

Luster:

Adamantine - Metallic

Streak:

gray

Optical Properties of Lueshite

Gladstone-Dale:

CI meas= -0.156 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.113 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.282,KPDmeas= 0.2928,KC= 0.2533
Ncalc = 2.12 - 2.17

Optical Data:

Biaxial (?), b=2.3, 2V(Meas)=45.

Calculated Properties of Lueshite

Electron Density:

Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Lueshite =4.61 gm/cc.

Fermion Index:

Fermion Index = 0.0001405731
Boson Index = 0.9998594269

Photoelectric:

PE_Lueshite= 86.63 barns/electron
U=PE_Lueshite x rElectron Density= 370.37 barns/cc.

Radioactivity:

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

Lueshite Classification

Dana Class:

04.03.03.04 (04)Simple Oxides

(04.03)with a cation charge of 3+ (A+++2 O3)

(04.03.03)Perovskite Group

04.03.03.01 Perovskite CaTiO3 P nma 2/m 2/m 2/m

04.03.03.02 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

04.03.03.03 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m

04.03.03.04 Lueshite NaNbO3 P 222₁ 2 2 2

04.03.03.05 Tausonite SrTiO3 P m3m 4/m 3 2/m

04.03.03.06 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m

04.03.03.07 Barioperovskite! BaTiO3 Amm2 mm2

04.03.03.08 Lakargiite! CaZrO3 P nma 2/m 2/m 2/m

Strunz Class:

04.CC.30 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.C - Metal:Oxygen = 2:3, 3:5, and Similar

04.CC -With large and medium-sized cations

04.CC.30 Natroniobite NaNbO3 Mono

04.CC.30 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

04.CC.30 Lueshite NaNbO3 P 222₁ 2 2 2

04.CC.30 Perovskite CaTiO3 P nma 2/m 2/m 2/m

04.CC.30 Barioperovskite! BaTiO3 Amm2 mm2

04.CC.30 Lakargiite! CaZrO3 P nma 2/m 2/m 2/m

Other Lueshite Information

References:

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

See Also:

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

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Ask about Lueshite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Lueshite

NaNbO3
Dana No: 04.03.03.04 Strunz No: 04.CC.30
Locality:

Notes: