Ilsemannite Mineral Data

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.

Ilsemannite Image

Images:

Ilsemannite

Comments: Dark blue ilsemannite.
Location: Gl?ckauf Shaft, Himmelsf?rst 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

Calculated Properties of Ilsemannite

Fermion Index

Fermion Index = 0.16913
Boson Index = 0.83087

Photoelectric:

PE_Ilsemannite= 110.06 barns/electron
U=PE_Ilsemannite x r_electron= . barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ilsemannite is Not Radioactive

Ilsemannite Classification

Dana Class:

4.6.3.1 (4)Simple Oxides

(4.6)not classified

(4.6.3)Dana Group

4.6.3.1 Ilsemannite Mo3O8·n(H2O)(?) None

Strunz Class:

IV/E.03-30 IV - Oxides

IV/E - Oxides with metal : oxygen < 1:2 (M2O5, MO3)

IV/E.03 - Molybdite - Ilsemannite series

IV/E.03-10 Molybdite MoO3 Pbnm 2/m 2/m 2/m

IV/E.03-20 Sidwillite MoO3·2(H2O) P 2₁/n 2/m

IV/E.03-30 Ilsemannite Mo3O8·n(H2O)(?) None

IV/E.03-40 Bamfordite! FeMo2O6(OH)3·(H2O) P1 or P1 Tri

Other Ilsemannite Information

References:

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

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Ilsemannite

Mo3O8·n(H2O) (?)
Dana No: 4.6.3.1 Strunz No: IV/E.03-30
Locality:

Notes: