| 释义 |
volkonskoite Min.|vɒlˈkɒnskəʊaɪt|
Also 9 wolch-, wolk-; volch-.
[ad. G. wolchonskoit (A. Kämmerer 1831, in Jahrb. f. Mineral., etc. II. 420), f. the name of Prince ‘Wolchonskoy’ (? i.e. Volkonsky): see -ite1.]
A green or bluish-green amorphous clay mineral of the montmorillonite group in which there is some substitution by chromium, now regarded as a variety of nontronite.
1844J. D. Dana Syst. Min. (ed. 2) vi. 533 Wolchonskoite. Amorphous. Dull-shining. 1852Amer. Jrnl. Sci. LXIV. 62 Silicated Chrome (Wolchonskoite?). 1892E. S. Dana Dana's Syst. Min. (ed. 6) 696 Wolchonskoite... Volchonskoite. 1953R. E. Grim Clay Mineral. iv. 58 Substitutions within the octahedral sheet [of montmorillonite] may vary from few to complete... Replacement of aluminum by iron yields nontronite; by chromium, volkonskoite; by zinc, sauconite. 1973Norsk Geol. Tidsskr. LIII. 329 The Cr2O3 content of volkonskoite may vary within wide limits, and values up to 15–20% have been reported from Russian occurrences. |