| http://www.w3.org/ns/prov#value | - Magnesium carbonate can be present initially in the formation in a variety of mineral forms of varying composition, such as magnesite or brucite; in association with calcium carbonate as dolomite, a calcium-magnesium carbonate; with iron as ferroan, an iron-magnesium carbonate; and with calcium and iron as ankerite, a form of dolomite in which there is about 15 percent iron substituted for magnesi
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