Also known as pleonaste, pleonast
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 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. It is sometimes used as a gemstone.
In the Vinony graph
Within Vinony's link graph, นิล is referenced by 7 other articles, and connects out to Sri Lanka, Greek and granite.
It is catalogued under the topic Spinel gemstones.
Its subject is documented across 6 Wikipedia language editions.
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Sri Lanka
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Greek
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granite
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chemical formula
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igneous rock
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metamorphic rock
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Mohs scale of mineral hardness
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gneiss
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solubility
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refractive index
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transparency
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cleavage
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crystal system
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streak
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pleochroism
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crystal habit
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relative density
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fracture
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Bravais lattice
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lustre
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