1. Mineralogy. a.
a gray, pink, or yellow mica, occurring in brittle monoclinic crystals.
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