| 释义 |
zirkelite Min.|ˈzɜːkəlaɪt|
[f. the name of Ferdinand Zirkel (1838–1912), German mineralogist + -ite1.]
A black monoclinic (pseudocubic) oxide of zirconium, calcium, thorium, titanium, rare earths, and other elements, (Ca,Th,Ce)Zr(Ti,Nb)2O7.
1895Hussak & Prior in Mineral. Mag. XI. 86 Zirkelite. A new calcium zirconate and titanate. 1962Mineral. Abstr. XV. 538/1 Zirkelite is widely distributed in the Palaeozoic ultrabasic and alkaline complexes of the Kola Peninsula where it occurs as an accessory mineral in calcite-amphibole rocks; [etc.]. 1972Nature 31 Mar. 215/1 We find that terrestrial zirkelite bears the closest comparison with the tranquillityite group, and yet contains sufficient CaO..to provide a possible link with any calcic lunar zirconian phases yet to be established. 1975[see zirconolite]. 1977Amer. Mineralogist LXII. 408 Zirconolite and niobozirconolite..are synonymous with zirkelite. 1981K. Frye Encycl. Mineral. 220/1 There is considerable controversy over the exact formulas of zirkelite and zirconolite. Some evidence suggests that there is no difference. |