| 释义 |
knopite Min.|ˈnɒpaɪt, ˈknɒpaɪt|
[ad. Sw. knopit (P. J. Holmquist 1894, in Geol. För. Förh. XVI. 73), f. the name of Adolf Knop (1828–93), Ger. mineralogist: see -ite1.]
A variety of perofskite occurring in lead-grey crystals, in which calcium is partly replaced by cerium.
1896Mineral. Mag. XI. 158 Minerals at first thought to be perofskite and dysanalyte are here described under the new name knopite. 1927Mineral. Abstr. III. 412 Knopite, a mineral new to Canada, occurs sparingly in small bunches in a basic pegmatite. 1947Ibid. X. 138 Knopite is here a rock-forming mineral of primary magmatic origin, in contrast to its other occurrences as a contact mineral or in pegmatite. 1962W. A. Deer et al. Rock-forming Min. V. 50 A variety [of perovskite] rich in rare earths, chiefly cerium, has been called knopite... In addition to rare earths of the cerium group, the lanthanum group is usually present. |
