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A slurry composition comprising an alkaline metal oxide, a chloride or phosphate salt, water, glass beads and a foaming agent. A foamed slurry comprising magnesium oxide, water, a chloride or phosphate salt, and glass beads, wherein the slurry has a density of from about 4 to about 12 pounds per gal

A slurry composition comprising an alkaline metal oxide, a chloride or phosphate salt, water, glass beads and a foaming agent. A foamed slurry comprising magnesium oxide, water, a chloride or phosphate salt, and glass beads, wherein the slurry has a density of from about 4 to about 12 pounds per gallon. A foamed slurry comprising magnesium oxide, water, a chloride or phosphate salt, and beads, wherein the slurry has a density of from about 4 to about 12 pounds per gallon and the set slurry is acid soluble.

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What is claimed is: 1. A slurry composition comprising: an alkaline metal oxide, a chloride or phosphate salt, water, glass beads and a foaming agent. 2. The composition of claim 1 wherein the alkaline metal oxide comprises magnesium oxide. 3. The composition of claim 2 wherein the magnesium o

What is claimed is: 1. A slurry composition comprising: an alkaline metal oxide, a chloride or phosphate salt, water, glass beads and a foaming agent. 2. The composition of claim 1 wherein the alkaline metal oxide comprises magnesium oxide. 3. The composition of claim 2 wherein the magnesium oxide comprises light burned magnesium oxide, hard-burned magnesium oxide, dead-burned magnesium oxide or combinations thereof. 4. The composition of claim 1 wherein the chloride or phosphate salt comprises magnesium chloride, potassium phosphate, sodium phosphate, ammonium phosphate or combinations thereof. 5. The composition of claim 1 wherein the chloride salt is magnesium chloride and wherein the ratio of magnesium oxide to magnesium chloride is about 2:1. 6. The composition of claim 2 wherein the ratio of magnesium oxide to phosphate salt is about 1:4. 7. The composition of claim 1 further comprising a retarder. 8. The composition of claim 1 further comprising a viscosifier, a suspension aid or combinations thereof. 9. The composition of claim 1 wherein the slurry is foamed to a foam quality from about 1% to about 50%. 10. The composition of claim 1 having a density of from about 4 to about 12 pounds per gallon. 11. The composition of claim 1 having a compressive strength of from about 100 psi to about 1,000 psi. 12. The composition of claim 1 displaying a right angle set. 13. The composition of claim 1 having about 100% acid solubility. 14. A foamed slurry comprising: magnesium oxide, water, a chloride or phosphate salt, and glass beads, wherein the slurry has a density of from about 4 to about 12 pounds per gallon. 15. The slurry of claim 14 wherein the slurry is foamed to foam quality of from about 1% to about 50%. 16. The slurry of claim 14 wherein the chloride salt comprises magnesium chloride. 17. The slurry of claim 16 wherein the ratio of magnesium oxide to magnesium chloride is about 2:1. 18. The slurry of claim 14 wherein the phosphate salt comprises potassium phosphate, sodium phosphate, ammonium phosphate or combinations thereof. 19. The slurry of claim 14 wherein the ratio of magnesium oxide to phosphate salt is about 1:4. 20. The slurry of claim 14 wherein the slurry sets to yield a cement with a compressive strength of from about 100 psi to about 1,000 psi. 21. A foamed slurry comprising: magnesium oxide, water, a chloride or phosphate salt, and glass beads, wherein the slurry has a density of from about 4 to about 12 pounds per gallon and the set slurry is acid soluble.