翻訳と辞書 ・ Ceylonese Legislative Council election, 1924 ・ Ceylonese Mudaliyars ・ Ceylonese parliamentary election, 1947 ・ Ceylonese parliamentary election, 1952 ・ Ceylonese parliamentary election, 1956 ・ Ceylonese parliamentary election, 1965 ・ Ceylonese parliamentary election, 1970 ・ Ceylonese parliamentary election, July 1960 ・ Ceylonese parliamentary election, March 1960 ・ Ceylonese recipients of British titles ・ Ceylonese rixdollar ・ Ceylonese Rugby & Football Club ・ Ceylonese State Council election, 1931 ・ Ceylonese State Council election, 1936 ・ Ceylonica ・ Ceylonite ・ Ceylonthelphusa ・ Ceylonthelphusa alpina ・ Ceylonthelphusa armata ・ Ceylonthelphusa callista ・ Ceyranbatan ・ Ceyrankeçməz ・ Ceyranlı ・ Ceyrançöl ・ Ceyras ・ Ceyrat ・ Ceyreste ・ Ceyroux ・ Ceyssac ・ Ceyssat
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Ceylonite
Ceylonite (first cited 1793) and pleonaste (first cited 1801) are dingy blue or grey to black varieties of spinel. Ceylonite, named for the island of Ceylon, is a ferroan spinel with Mg:Fe from 3:1 and 1:1, and little or no ferric iron. Pleonaste is named from the Greek for 'abundant,' for its many crystal forms, and is distinguished chemically by low Mg:Fe ratios of approximately 1:3. ==Composition==
The mineral ceylonite has the chemical composition of (Mg, Fe2+) Al2O4, putting it into a group of minerals known as the spinels, or the oxide spinels. The oxide spinels have a formula of the model ()()2O4; where () is commonly Fe2+, Mg2+, or Mn2+, and () is Fe3+, Al3+, or Cr3+.
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