margarite

margarite

[mahr-guh-rahyt]
noun
1.
Mineralogy.
a.
a gray, pink, or yellow mica, occurring in brittle monoclinic crystals.
b.
an aggregate of small, rudimentary crystals resembling minute globules in a row: found in glassy volcanic rocks.
2.
Obsolete. a pearl.

Origin:
before 1000; Middle English, Old English: pearl < Latin margarīta < Greek margarī́tēs, perhaps < Iranian (compare Pahlavi marvārīt pearl), with final element conformed to Greek -ītēs -ite1

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World English Dictionary
margarite (ˈmɑːɡəˌraɪt)
 
n
1.  a pink pearly micaceous mineral consisting of hydrated calcium aluminium silicate. Formula: CaAl4Si2O10(OH)2
2.  an aggregate of minute beadlike masses occurring in some glassy igneous rocks
 
[C19: via German from Greek margaron pearl]

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