Mineralogy Database

Montanite Mineral Data

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General Montanite Information

Help on Chemical  Formula: Chemical Formula: Bi2Te++++++O6•2(H2O)
Help on Composition: Composition: Molecular Weight = 677.59 gm
   Bismuth    61.68 %  Bi   68.77 % Bi2O3
   Tellurium  18.83 %  Te   23.55 % TeO2
   Hydrogen    0.60 %  H     5.32 % H2O
   Oxygen     18.89 %  O
             ______        ______ 
             100.00 %       97.64 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Bi2TeO6•2(H2O)
Help on Environment: Environment: Alteration of tetradymite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1868
Help on Locality: Locality: Highland, Montana, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Montanite + Pronunciation Say MONTANITE

Montanite Image

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Comments: Grayish-green montanite grain in matrix.
Location: Zupkov (Zsubko; Schubkau), Stredoslovenský Kraj, Slovak Republic. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Montanite Crystallography

Help on Crystal System: Crystal System: Monoclinic
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.54(1), 2.6(0.9), 1.892(0.8),1.708(0.5), 3.22(0.5), 1.504(0.3), 2.95(0.3), 2.04(0.2),

Physical Properties of Montanite

Help on Color: Color: Greenish, Greenish white, Yellowish, White, Light yellow.
Help on Density: Density: 3.8
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Earthy (Dull)
Help on Magnetism: Magnetism: Nonmagnetic

Optical Properties of Montanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.681 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2868,KC= 0.1706
Ncalc = 1.65
Help on Optical Data: Optical Data: Biaxial (-), a=2.09, b=2.09, , 2V(Meas)=0-15. Dispersion r < v extreme.
Help on Pleochroism (x): Pleochroism (x): green.
Help on Pleochroism (y): Pleochroism (y): green.
Help on Pleochroism (z): Pleochroism (z): green.

Calculated Properties of Montanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Montanite =3.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMontanite =1,244.40 barns/electron
U=PEMontanite x rElectron Density=3,991.85 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Montanite is Not Radioactive

Montanite Classification

Help on  Dana Class: Dana Class: (33)Selenates and Tellurates
  (33.02)as A+ (B++)m XO6 Zq � x(H2O) where x can equal 0
  (33.02.02)Dana Group Montanite Bi2TeO6•2(H2O) Mono
Help on  Strunz Class: Strunz Class: 07.CD.60 07 - SULFATES (SELENATES, TELLURATES)
  07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O
  07.CD -With only large cations
07.CD.60 Montanite Bi2TeO6•2(H2O) Mono

Other Montanite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Montanite :
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: 07.CD.60





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