Where it forms, where it's found
- Type locality
- Bad Bleiberg
- Villach-Land District
- Carinthia
- Austria
46.6167°, 13.6833°
133recorded occurrences
Physical
- Transparency
- Translucent
- Colour
- Black · blue-black · or blue · turns blue on exposure
- Streak
- pale blue
Crystallography
- Morphology
Earthy masses or crusts; as a stain or disseminated pigment.
- Comment
Amorphous. Point Group: n.d. Space Group: n.d. Z = n.d.
Synonyms
- Ilesmannite
- Ilsemanniet
- Molybdänblau
- Molybdenum Blue
In other languages
- German
- Ilsemannit
- Italian
- ilsemannite
- Chinese
- 蓝钼矿
Classification
Strunz
10th ed.4.FJ.15
- 4OxidesClass
- 4.FHydroxides (without V or U)Division
- 4.FJHydroxides with H2O +- (OH); corner-sharing octahedraGroup
- 4.FJ.15IlsemanniteSpecies
Dana
8th ed.04.06.03.01
- 04Simple OxidesClass
- 04.06MiscellaneousType
- 04.06.03— unnamed intermediate level —Group
- 04.06.03.01IlsemanniteSpecies
CIM
—7.15.4
- 7Oxides and HydroxidesClass
- 7.15Oxides of Mo and WGroup
- 7.15.4IlsemanniteSpecies
Group, growth & confusion
Literature, links & citation
Citations
- 1871Höfer, H. (1871) Ilsemannit, ein natürliches Molybdänsalz. Neues Jahrbuch für Mineralogie, Geologie und Palaontologie: 1871: 566-570.
- 1916Horton, F.W. (1916) Molybdenum - its ores and their concentration. United States Bureau of Mines and Geology Bulletin 111: 132p.: 111.
- 1917Schaller, W.T. (1917) Ilsemannite, hydrous sulphate of molybdenum. Journal of the Washington Academy of Sciences, 7. 417-420
- 1922Cook, C.W. (1922) A new occurrence of ilsemannite. American Journal of Science: 4: 50-52.
- 1925Hess, F.L. (1925) Ilsemannite at Ouray, Utah. United States Geological Survey, Bulletin 750A: 750: 1-16.
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Ilsemannite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/ilsemannite-2015},
note = {Accessed 2026-05-11}
}