rubellite

[roo-bel-ahyt, roo-buh-lahyt]
noun
a deep-red variety of tourmaline, used as a gem.

Origin:
1790–1800; < Latin rubell(us) reddish (see rubella) + -ite1

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rubellite (ˈruːbɪˌlaɪt, ruːˈbɛl-)
 
n
a red transparent variety of tourmaline, used as a gemstone
 
[C18: from Latin rubellus reddish]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Cut in a convex form known as a cabochon, this red tourmaline could also be called a rubellite because of its red coloration.
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