knopiten.
/ˈnɒpʌɪt//ˈknɒpʌɪt/ Mineralogy.
A variety of perofskite occurring in lead-grey crystals, in which calcium is partly replaced by cerium.
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the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > oxides of titanium, tantalum, nickel, or rare earths > perovskite
perovskite1840
knopite1896
1896 Mineral. Mag. 11 158 Minerals at first thought to be perofskite and dysanalyte are here described under the new name knopite.
1899 J. D. Dana Min. App. i. 39 Knopite... A mineral closely related to perovskite,..but containing cerium without niobium or tantalum and thus intermediate between it and dysanalyte.
1927 Mineral. Abstr. 3 412 Knopite, a mineral new to Canada, occurs sparingly in small bunches in a basic pegmatite.
1947 Mineral Abstr. 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.
1962 W. A. Deer et al. Rock-forming Minerals 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.
This entry has not yet been fully updated (first published 1933; most recently modified version published online March 2022).
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