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Ilsemannite

Big Photo

Vrchoslav fluorite deposit, Krupka (Graupen), Krušné Hory Mts (Erzgebirge), Ústí Region, Bohemia (Böhmen; Boehmen), Czech Republic
© Petr Fuchs

Show Ilsemannite Photos (11)
Formula:
Mo
 
3
O
 
8
·nH
 
2
O
Colour:Black, blue-black, or ...
Name:After J.C. Ilsemann (1727-1822), a former Mining Commissioner at Clausthal, Harz, who published an early study of molybdenite (1787).


See also the visually similar mourite.

Classification of Ilsemannite

IMA status:Questionable/Doubtful
Strunz 8th edition ID:4/E.03-30
Nickel-Strunz 10th (pending) edition ID:4.FJ.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
J : Hydroxides with H2O +- (OH); corner-sharing octahedra
Dana 8th edition ID:4.6.3.1

4 : SIMPLE OXIDES
6 : Miscellaneous
Hey's CIM Ref.:7.15.4

7 : Oxides and Hydroxides
15 : Oxides of Mo and W
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Type Occurrence of Ilsemannite

Type Locality:Bad Bleiberg, Bleiberg District, Gailtaler Alpen & Karnische Alpen Mts, Carinthia, Austria
Year of Discovery:1871

Physical Properties of Ilsemannite

Colour:Black, blue-black, or blue; turns blue on exposure

Crystallography of Ilsemannite

Morphology:Earthy masses or crusts; as a stain or disseminated pigment.

Chemical Properties of Ilsemannite

Formula:
Mo
 
3
O
 
8
·nH
 
2
O
Essential elements:H, Mo, O
All elements listed in formula:H, Mo, O

Relationship of Ilsemannite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.FJ.05Meymacite
WO
 
3
·2H
 
2
O
4.FJ.05Sidwillite
MoO
 
3
·2H
 
2
O
4.FJ.10Tungstite
WO
 
3
·H
 
2
O
4.FJ.15Hydrotungstite
WO
 
3
·2H
 
2
O
4.FJ.20Parabariomicrolite
BaTa
 
4
O
 
10
(OH)
 
2
·2H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
7.15.1Tugarinovite
MoO
 
2
7.15.2Molybdite
MoO
 
3
7.15.3Sidwillite
MoO
 
3
·2H
 
2
O
7.15.5Tungstite
WO
 
3
·H
 
2
O
7.15.6Hydrotungstite
WO
 
3
·2H
 
2
O
7.15.7Meymacite
WO
 
3
·2H
 
2
O
7.15.8Alumotungstite
(W,Al)(O,OH)
 
3
7.15.9Jixianite
Pb(W,Fe
3+
 
)
 
2
(O,OH)
 
7

Other Names for Ilsemannite

Synonyms:
Molybdenum Blue
Other Languages:
German:Ilsemannit
Molybdänblau
Spanish:Ilsemannita

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ilsemannite

Reference List:Höfer (1871), Jb. Min.: 566.

Horton (1916), US Bureau of Mines Bulletin 111: 15.

Schaller (1917), WashingtonAc Sc., Journal: 7: 417.

Hess (1923), USGS Bulletin 750A.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 603-604.

Staples, Lloyd William (1951), Ilsemannite and jordisite: American Mineralogist: 36: 609-614.

Internet Links for Ilsemannite

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    Localities for Ilsemannite

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