a usually green or white mineral of the clinopyroxene group, found in igneous and metamorphic rocks. It is used as a gemstone (jade). Composition: sodium aluminium silicate. Formula: NaAlSi2O6. Crystal structure: monoclinic
jadeite in American English
(ˈdʒeɪdˌaɪt)
noun
a translucent, usually greenish, mineral, sodium aluminum iron silicate, Na(Al,Fe)Si2O6, of the pyroxene group, found only in metamorphic rock, esp. in Myanmar: it is the most precious type of jade