nefedyevite Min.
(nɛfɛˈdjɛvaɪt)
Also † nefediewite, nefedievite.
[ad. Russ. nefed{p}evit (P. Puzyrevsky 1872, in Zapiski imperat. S.-Peterburgsk. mineral. Obshch. VII. 15, f. the name of V. V. Nefed{p}ev, 19th–cent. Russian mineralogist: see -ite1.]
A white or pinkish aluminosilicate of magnesium and calcium belonging to the clay family and similar to montmorillonite.
| 1873 Jrnl. Chem. Soc. XXVI. 1210 Nefediewite; a new mineral... This amorphous mineral, very much like lithomarge, occurs, together with fluorspar, in the limestone of Nertschinsk. 1938 Mineral. Abstr. VII. 104 Greenish-grey unctuous clay interbedded among Cretaceous limestones, the bulk of which consists of a fibrous crystalline aggregate..and in composition..corresponds to nefedievite. 1961 Doklady Earth Sci. CXXXV. 1296/1 In view of the great structural similarity between true montmorillonite and nefedyevite, doubling of the unit cell along the c axis can be expected. |