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A dry powdered flowable cement composition contains calcium carbonate and a partially decarbonated magnesium carbonate. A slurry of the composition will set hard with various organic fillers including waste products and toxic waste. The composition can be slurried with contaminated water such as sea

A dry powdered flowable cement composition contains calcium carbonate and a partially decarbonated magnesium carbonate. A slurry of the composition will set hard with various organic fillers including waste products and toxic waste. The composition can be slurried with contaminated water such as sea water, mineral laden ground water and muddy water. A high percentage of filler can be added while still having an acceptable set.

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[What is claimed is:] [1.](a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500.degree. C. to 800.degree. C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon di

[What is claimed is:] [1.](a) a naturally-occurring dolomite, wherein the dolomite is heated at a temperature within the range of 500.degree. C. to 800.degree. C. to cause preferential decarbonization of the magnesium carbonate by liberating carbon dioxide, whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate without substantially decarbonizing the calcium carbonate resulting in a mixture of magnesium oxide, magnesium carbonate, and calcium carbonate (MgO, MgCO.sub.3, and CaCO.sub.3); and,(b) a synthetic blend formed by mixing calcium carbonate with preformed caustic magnesium oxide, the preformed caustic magnesium oxide being prepared by heating magnesium carbonate to 500.degree. C. to 800.degree. C. to partially drive off carbon dioxide whereby between 2% to 50% of the carbon dioxide is retained within the magnesium carbonate, and wherein the calcium carbonate retains substantially all of its carbon dioxide resulting in a mixture of magnesium oxide, magnesium carbonate and calcium carbonate (MgO, MgCO.sub.3 and CaCO.sub.3).