Ilsemannite Mineral Data

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General Ilsemannite Information

Chemical Formula:

Mo3O8•n(H2O) (?)

Composition:

Molecular Weight = 433.83 gm

Molybdenum 66.34 % Mo 99.54 % MoO₃

Hydrogen 0.46 % H 4.15 % H₂O

Oxygen 33.19 % O

______ ______

100.00 % 103.69 % = TOTAL OXIDE

Empirical Formula:

Mo₃O₈•(H₂O)

Environment:

Alteration product of molybdenite.

IMA Status:

Valid Species (Pre-IMA) 1871

Locality:

Blieberg, Carinthia, Austria. Link to MinDat.org Location Data.

Name Origin:

Named for J. C. Ilsemann (1727-1822), mining commissioner at Clausthal, Harz, Germany.

Name Pronunciation:

Ilsemannite + Pronunciation

Ilsemannite Image

Images:

Ilsemannite

Comments: Dark blue ilsemannite.
Location: Glückauf Shaft, Himmelsfürst Mine, Brand-Erbisdorf, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Ilsemannite Crystallography

Crystal System:

Amorphous- No Crystals

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

By Intensity(I/I_o): 3.36(1), 1.64(0.5), 4.23(0.5),

Physical Properties of Ilsemannite

Cleavage:

{???} Good

Color:

Blue, Blue black, Black.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Hardness:

5.5-6 - Knife Blade-Orthoclase

Streak:

brownish black

Optical Properties of Ilsemannite

Optical Data:

Calculated Properties of Ilsemannite

Fermion Index:

Fermion Index = 0.16
Boson Index = 0.84

Photoelectric:

PE_Ilsemannite= 110.06 barns/electron
U=PE_Ilsemannite x rElectron Density= . barns/cc.

Radioactivity:

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

Ilsemannite Classification

Dana Class:

04.06.03.01 (04)Simple Oxides

(04.06)not classified

(04.06.03)Dana Group

04.06.03.01 Ilsemannite Mo3O8•n(H2O)(?) None

Strunz Class:

04.FJ.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.F - Hydroxides (without V or U)

04.FJ -Hydroxides with H2O ± (OH); corner-sharing octahedra

04.FJ.15 Ilsemannite Mo3O8•n(H2O)(?) None

04.FJ.15 Hydrotungstite H2WO4•(H2O) P 2/m 2/m

Other Ilsemannite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ilsemannite :
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 Ilsemannite Specimen Label here :

Ilsemannite

Mo3O8•n(H2O) (?)
Dana No: 04.06.03.01 Strunz No: 04.FJ.15
Locality:

Notes: