ilsemanniten.
/ˈɪlsəmənʌɪt/ Mineralogy.
A black or dark blue secondary molybdenum mineral, perhaps a hydrated oxide of molybdenum, Mo3O8.nH2O, which occurs as earthy masses or crusts and as a blue stain and dissolves in water to give a blue solution.
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ilsemannite1871
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1871 Jrnl. Chem. Soc. 24 1173 Ilsemannite... The author gives this name to native molybdic molybdate, MoO2.4MoO3, occurring at Bleiberg in Carinthia, as a bluish-black to black, mostly earthy or cryptocrystalline deposit, between groups of crystals of barium sulphate.
1872 J. D. Dana Min. (1880) Appendix i. 7 Ilsemannite is a product of the decomposition of metallic molybdates.
1923 Bull. U.S. Geol. Surv. No. 750. 16 Ilsemannite, like wulfenite, is probably formed from some unknown mineral, perhaps a sulphide.
1951 Amer. Mineralogist 36 611 In general, most mineralogists seem to have applied the name ‘ilsemannite’ to any molybdenum compound or mixture which is water soluble and turns the solution a typical molybdenum-blue color.
1959 Econ. Geol. 54 257 Ilsemannite is forming rapidly on the walls of the older mine workings.
This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2018).
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