Mineralogy Database

Changbaiite Mineral Data

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General Changbaiite Information

Help on Chemical  Formula: Chemical Formula: PbNb2O6
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: PbNb2O6
Help on Environment: Environment: In kaolin veinlest and kaolin-filled cavities.
Help on IMA Status: IMA Status: Approved IMA 1978
Help on Locality: Locality: Chanbai Mountains, Tonghua, Jilin, China. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: ICSD 24855
  PDF 29-780

Changbaiite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:1.10039
Help on Cell Dimensions: Cell Dimensions: a = 10.499, c = 11.553, Z = 9; V = 1,102.86 Den(Calc)= 6.63
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.1(1), 3.028(0.9), 1.76(0.6),

Physical Properties of Changbaiite

Help on Cleavage: Cleavage: {0001} Perfect, {1011} Distinct
Help on Color: Color: Colorless, Cream white, Pale brown, Yellow brown, Pale yellow green.
Help on Density: Density: 6.48
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine - Pearly
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: white

Optical Properties of Changbaiite

Help on Gladstone-Dale: 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
Help on Optical Data: Optical Data: Uniaxial (+), w=2.476, e=2.485, bire=0.0090.

Calculated Properties of Changbaiite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.75 gm/cc
note: Specific Gravity of Changbaiite =6.63 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.09
Boson Index = 0.91
Help on Photoelectric: Photoelectric: PEChangbaiite = 812.11 barns/electron
U=PEChangbaiite x rElectron Density=4,668.53 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Changbaiite is Not Radioactive

Changbaiite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.11)Dana Group Changbaiite PbNb2O6 R 3m 3m Rosiaite! PbSb2O6 P 31m 3 2/m
Help on  Strunz Class: 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 (� medium-sized) cations; dimers and trimers of edge-sharing octahedra
04.DF.10 Changbaiite PbNb2O6 R 3m 3m

Other Changbaiite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Dana No: Strunz No: 04.DF.10





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