Changbaiite Mineral Data

Changbaiite Mineral Data

General Changbaiite Information

Chemical Formula:

PbNb2O6

Composition:

Molecular Weight = 489.01 gm

Niobium 38.00 % Nb 54.36 % Nb₂O₅

Lead 42.37 % Pb 45.64 % PbO

Oxygen 19.63 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbNb₂O₆

IMA Status:

Approved IMA 1978

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 24855

PDF 29-780

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Changbaiite Crystallography

Axial Ratios:

a:c = 1:1.10039

Cell Dimensions:

a = 10.499, c = 11.553, Z = 9; V = 1,102.86 Den(Calc)= 6.63

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 3.1(1), 3.028(0.9), 1.76(0.6),

Physical Properties of Changbaiite

Cleavage:

[0001] Perfect, [1011] Distinct

Color:

Colorless, Cream white, Pale brown, Yellow brown, Pale yellow green.

Density:

6.48

Diaphaniety:

Transparent

Hardness:

5.5 - Knife Blade

Luster:

Adamantine - Pearly

Streak:

white

Optical Properties of Changbaiite

Gladstone-Dale:

CI meas= -0.107 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.082 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2233,KPDmeas= 0.2285,KC= 0.2064

Optical Data:

Uniaxial (+), w=2.476, e=2.485, bire=0.0090.

Calculated Properties of Changbaiite

Electron Density:

r_electron=5.75 gm/cc
note: r_Changbaiite=6.63 gm/cc.

Fermion Index

Fermion Index = 0.09373
Boson Index = 0.90627

Photoelectric:

PE_Changbaiite= 812.11 barns/electron
U=PE_Changbaiite x r_electron=4,668.53 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Changbaiite is Not Radioactive

Changbaiite Classification

Dana Class:

8.3.11.1 (8)Multiple Oxides with Nb, Ta, and Ti

(8.3)where A (B2O6)

(8.3.11)Dana Group

8.3.11.1 Changbaiite PbNb2O6 R 3m 3m

8.3.11.2 Rosiaite! PbSb2O6 P 31m 3 2/m

Strunz Class:

IV/D.30-10 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.30 - Badleyite - Uraninite series, Changbaite

IV/D.30-05 Rosiaite! PbSb2O6 P 31m 3 2/m

IV/D.30-10 Changbaiite PbNb2O6 R 3m 3m

Other Changbaiite 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 Changbaiite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Changbaiite

PbNb2O6
Dana No: 8.3.11.1 Strunz No: IV/D.30-10
Locality:

Notes: