| 释义 |
johnstrupite Min.|ˈjɒnstrjuːpaɪt, ˈdʒɒnstrəpaɪt|
[ad. G. johnstrupit (W. C. Brögger 1890, in Zeitschr. f. Krystallogr. u. Mineral. XVI. 75), f. the name of J. F. Johnstrup (1818–1894), Danish geologist: see -ite1.]
A brownish green hydrous silicate and fluoride of several metals.
1890Jrnl. Chem. Soc. LVIII. 1077 In addition to the minerals previously known, the author [sc. Brögger] has found..johnstrupite. 1906J. P. Iddings Rock Minerals ii. 458 Mosandrite and johnstrupite occur in nephelite-syenites and closely related rocks, chiefly in the region of the Langesund fjord, Norway; also in the aphanitic and lava equivalents in other localities. 1959Mineral. Abstr. XIV. 105/1 Calculations of the unit cell contents..give the following formulae:..johnstrupite (Ca, Na, Ce)12 (Ti, Mg, Al, Zr)3Si7O31H2F4-5... The authors conclude that mosandrite and johnstrupite are varieties of the same species. 1965Ibid. XVII. 287/1 Selective concentration of B..has been observed in specimens of..mosandrite and johnstrupite. |