alexandrites

alexandrite

[al-ig-zan-drahyt, -zahn-]
noun Mineralogy.
a variety of chrysoberyl, green by daylight and red-violet by artificial light, used as a gem.

Origin:
1830–40; named after Alexander I of Russia; see -ite1

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alexandrite (ˌælɪɡˈzændraɪt)
 
n
a green variety of chrysoberyl used as a gemstone
 
[C19: named after Alexander I (1777--1825), tsar of Russia (1801--25); see -ite1]

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