pyrope

[pahy-rohp]
noun
a mineral, magnesium-aluminum garnet, Mg 3 Al 2 Si 3 O 1 2 , occurring in crystals of varying shades of red, and frequently used as a gem.

Origin:
1300–50; Middle English pirope < Latin pyrōpus gold-bronze < Greek pyrōpós literally, fire-eyed, equivalent to pyr- pyr- + ōp- (stem of ṓps) eye + -os adj. suffix

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World English Dictionary
pyrope (ˈpaɪrəʊp)
 
n
a deep yellowish-red garnet that consists of magnesium aluminium silicate and is used as a gemstone. Formula: Mg3Al2(SiO4)3
 
[C14 (used loosely of a red gem; modern sense C19): from Old French pirope, from Latin pyrōpus bronze, from Greek purōpus fiery-eyed, from pur fire + ōps eye]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia

pyrope

magnesium aluminum garnet (Mg3Al2), the transparent form of which is used as a gemstone. Its colour varies from brownish red to purplish red. A beautiful, deep-red pyrope is often called ruby, in combination with the locality of occurrence, as Cape ruby from South Africa. It is also used in jewelry as the Bohemian garnet.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Characteristic accessory minerals include pyrope garnet, monticellite, rutile and perovskite.
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