johannsenite Min.
(dʒəʊˈhænsənaɪt)
[f. the name of Albert Johannsen (1871–1962), American geologist: see -ite1.]
A brown, greyish, or greenish silicate of calcium and manganese, CaMnSi2O6, which often occurs with partial substitution of ferrous iron for manganese.
| 1932 Amer. Mineralogist XVII. 575 The Mineralogical Society of America... List of papers to be presented Wednesday, December 28, 1932... W. T. Schaller.—Johannsenite, a new manganese pyroxene. 1963 W. A. Deer et al. Rock-Forming Min. II. 75 Johannsenite, the manganese analogue of diopside and hedenbergite, occurs in metasomatized limestones, and is found less frequently as a vein mineral. |