Lueshite Mineral Data

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.

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),

Physical Properties of Lueshite

Cleavage:

[001] Indistinct

Color:

Black, Brown.

Density:

4.44

Diaphaniety:

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= -0.114 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.282,KPDmeas= 0.2928,KC= 0.2533

Optical Data:

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

Calculated Properties of Lueshite

Electron Density:

r_electron=4.28 gm/cc
note: r_Lueshite=4.61 gm/cc.

Fermion Index

Fermion Index = 0.00014
Boson Index = 0.99986

Photoelectric:

PE_Lueshite= 86.63 barns/electron
U=PE_Lueshite x r_electron= 370.37 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lueshite is Not Radioactive

Lueshite Classification

Dana Class:

4.3.3.4 (4)Simple Oxides

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

(4.3.3)Dana Group

4.3.3.1 Perovskite CaTiO3 P nma 2/m 2/m 2/m

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

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

4.3.3.4 Lueshite NaNbO3 P 222₁ 2 2 2

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

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

Strunz Class:

IV/C.10-60 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.10 - Perowskite series

IV/C.10-10 Uhligite Ca3(Ti,Al,Zr)9O20 Unk Cubic

IV/C.10-20 Perovskite CaTiO3 P nma 2/m 2/m 2/m

IV/C.10-30 Latrappite (Ca,Na)(Nb,Ti,Fe)O3 Pcmn 2/m 2/m 2/m

IV/C.10-40 Tausonite SrTiO3 P m3m 4/m 3 2/m

IV/C.10-50 Loparite-(Ce) (Ce,Na,Ca)2(Ti,Nb)2O6 P m3m 4/m 3 2/m

IV/C.10-55 Isolueshite! (Na,La,Ca)(Nb,Ti)O3 P m3m 4/m 3 2/m

IV/C.10-60 Lueshite NaNbO3 P 222₁ 2 2 2

IV/C.10-70 Natroniobite NaNbO3 Mono

IV/C.10-80 Macedonite PbTiO3 P 4/mmm 4/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)

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

Lueshite

NaNbO3
Dana No: 4.3.3.4 Strunz No: IV/C.10-60
Locality:

Notes: