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.
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