Ceylonite (first cited 1793) and pleonaste (first cited 1801) or pleonast are dingy blue or grey-to-black varieties of spinel. Ceylonite, named for the island of Ceylon, is a ferroan spinel mineral with Mg:Fe from 3:1 and 1:1, and little or no ferric iron.
Ceylonite (first cited 1793) and pleonaste (first cited 1801) or pleonast are dingy blue or grey-to-black varieties of spinel. Ceylonite, named for the island of Ceylon, is a ferroan spinel mineral with Mg:Fe from 3:1 and 1:1, and little or no ferric iron.
Source: Wikipedia "Ceylonite" · CC BY-SA 4.0
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