Magnesite, MgCO3, is the magnesian end member of the calcium-magnesium carbonates. It has a trigonal crystal system and crystal formation is uncommon.
Highlighting FeaturesMagnesium (Mg) atoms A single carbonate (CO32-) anion (note the 3-fold planar coordination) Carbonate (CO32-) anions Single unit cell Show all atoms
Less common than calcite, it is rare in sedimentary rock. Magnesite occurs as replacement deposits and can be found in Brazil, India, Greece and Russia. Large deposits are in Austria. May be used in cement and bricks.
Graf, D.L. 1961. Crystallographic tables for the rhombohedral carbonates. American Mineralogist. 46:1283-1316.