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Montanite Mineral Data
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General Montanite Information
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 Chemical Formula: |
Bi2Te++++++O6•2(H2O) |
| Composition: |
Molecular Weight = 677.59 gm |
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Bismuth 61.68 % Bi 68.77 % Bi2O3 |
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Tellurium 18.83 % Te 23.55 % TeO2 |
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Hydrogen 0.60 % H 5.32 % H2O |
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Oxygen 18.89 % O |
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______ ______ |
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100.00 % 97.64 % = TOTAL OXIDE |
| Empirical Formula: |
Bi2TeO6•2(H2O) |
| Environment: |
Alteration of tetradymite. |
| IMA Status: |
Valid Species (Pre-IMA) 1868 |
| Locality: |
Highland, Montana, USA. Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Montanite + Pronunciation  |
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Montanite Image |
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Images:
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Montanite
Comments: Grayish-green montanite grain in matrix.
Location: Zupkov (Zsubko; Schubkau), Stredoslovenský Kraj, Slovak Republic.
Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag |
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Montanite Crystallography
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| Crystal System: |
Monoclinic |
| 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), |
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Physical Properties of Montanite
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| Color: |
Greenish, Greenish white, Yellowish, White, Light yellow. |
| Density: |
3.8 |
| Diaphaneity: |
Opaque |
| Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Earthy (Dull) |
| Magnetism: |
Nonmagnetic |
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Optical Properties of Montanite
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| Gladstone-Dale: |
CI meas= -0.681 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2868,KC= 0.1706
Ncalc = 1.65 |
| Optical Data: |
Biaxial (-), a=2.09, b=2.09, , 2V(Meas)=0-15. Dispersion r < v extreme. |
| Pleochroism (x): |
green. |
| Pleochroism (y): |
green. |
| Pleochroism (z): |
green. |
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Calculated Properties of Montanite
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| Electron Density: |
Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Montanite =3.80 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEMontanite =1,244.40 barns/electron
U=PEMontanite x rElectron Density=3,991.85 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Montanite is Not Radioactive |
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Montanite Classification
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| Dana Class: |
33.02.02.01 (33)Selenates and Tellurates |
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(33.02)as A+ (B++)m XO6 Zq � x(H2O) where x can equal 0 |
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(33.02.02)Dana Group |
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33.02.02.01 Montanite Bi2TeO6•2(H2O) Mono |
| Strunz Class: |
07.CD.60 07 - SULFATES (SELENATES, TELLURATES) |
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07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O |
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07.CD -With only large cations |
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07.CD.60 Montanite Bi2TeO6•2(H2O) Mono |
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Other Montanite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana) OPTIC PROP.(Dana8) |
| 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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Print or Cut-and-Paste your Montanite Specimen Label here :
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Montanite
Bi2Te++++++O6•2(H2O)
Dana No: 33.02.02.01 Strunz No: 07.CD.60
Locality:
Notes:
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