Montanite Mineral Data

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General Montanite Information

Chemical Formula:

Bi2Te++++++O6•2(H2O)

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

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

Montanite Image

Images:

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

Montanite Crystallography

Crystal System:

Monoclinic

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

By Intensity(I/I_o): 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

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

Optical Properties of Montanite

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.

Calculated Properties of Montanite

Electron Density:

Bulk Density (Electron Density)=3.21 gm/cc
note: Specific Gravity of Montanite =3.80 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Montanite=1,244.40 barns/electron
U=PE_Montanite x rElectron Density=3,991.85 barns/cc.

Radioactivity:

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

Montanite Classification

Dana Class:

33.02.02.01 (33)Selenates and Tellurates

(33.02)as A+ (B++)m XO6 Zq · x(H2O) where x can equal 0

(33.02.02)Dana Group

33.02.02.01 Montanite Bi2TeO6•2(H2O) Mono

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

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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

Montanite

Bi2Te++++++O6•2(H2O)
Dana No: 33.02.02.01 Strunz No: 07.CD.60
Locality:

Notes: