A black magnetic mineral consisting of magnesium carbonate

• A source of magnesium

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Magnesite \Mag"ne*site\, n. [Cf. F. magn['e]site.] (Min.) Native magnesium carbonate occurring in white compact or granular masses, and also in rhombohedral crystals.

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) A form of magnesium carbonate, magnesiumcarbonoxygen 3 , occurring as dolomite (with calcite) but rarely found in the pure state.

WordNet Word definitions in WordNet
n. a black magnetic mineral consisting of magnesium carbonate; a source of magnesium

Wikipedia Word definitions in Wikipedia
Magnesite is a mineral with the chemical formula Mg C O ( magnesium carbonate ). Mixed crystals of iron(II) carbonate and magnesite (mixed crystals known as ankerite ) possess a layered structure: monolayers of carbonate groups alternate with magnesium ...