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

Environment:

In kaolin veinlest and kaolin-filled cavities.

IMA Status:

Approved IMA 1978

Locality:

Chanbai Mountains, Tonghua, Jilin, China. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 24855

PDF 29-780

Changbaiite Image

Images:

Changbaiite

Comments: BSE image of a zircon grain with inclusions of bastnasite? (bs), columbite (cb), cerofluorite (ce), chanbaiite (ch), cryolite (cry), thorite (th), xenotime (xe) and niobium-rich iron oxides (Nb-Fea).
Location: Rhyolite laccoliths from the Sierra Blanca Peaks, Trans-Peco region, Texas. (AmMin, v 74:865). Scale: See Image.
© American Mineralogist

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 Pyramidal H-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

Diaphaneity:

Transparent

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5.5 - Knife Blade

Luminescence:

Non-fluorescent.

Luster:

Adamantine - Pearly

Magnetism:

Nonmagnetic

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
Ncalc = 2.34 - 2.37

Optical Data:

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

Calculated Properties of Changbaiite

Electron Density:

Bulk Density (Electron Density)=5.75 gm/cc
note: Specific Gravity of Changbaiite =6.63 gm/cc.

Fermion Index:

Fermion Index = 0.09
Boson Index = 0.91

Photoelectric:

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

Radioactivity:

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

Changbaiite Classification

Dana Class:

08.03.11.01 (08)Multiple Oxides with Nb, Ta, and Ti

(08.03)where A (B2O6)

(08.03.11)Dana Group

08.03.11.01 Changbaiite PbNb2O6 R 3m 3m

08.03.11.02 Rosiaite! PbSb2O6 P 31m 3 2/m

Strunz Class:

04.DF.10 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.D - Metal:Oxygen = 1:2 and similar

04.DF -With large (ï¿½ medium-sized) cations; dimers and trimers of edge-sharing octahedra

04.DF.10 Changbaiite PbNb2O6 R 3m 3m

Other Changbaiite Information

References:

NAME( Dana8) 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 - 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

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

Changbaiite

PbNb2O6
Dana No: 08.03.11.01 Strunz No: 04.DF.10
Locality:

Notes:

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