a white, colourless, or lightly tinted mineral consisting of naturally occurring magnesium carbonate in hexagonal crystalline form: a source of magnesium and also used in the manufacture of refractory bricks. Formula: MgCO3
Word origin
C19: from magnesium + -ite1
magnesite in American English
(ˈmægnəˌsaɪt)
noun
a light-colored, semihard mineral, magnesium carbonate, MgCO3, used widely in industry as a source of magnesium and carbon dioxide