21. Said composition is relatively low in magnesium oxide but high in titanium dioxide, calcium oxide , and niobium. 22. The most common forms are CaCO 3 ( calcium carbonate ) and CaO ( calcium oxide ). 23. On heating above 1350�C, it begins to decompose to tricalcium aluminate, calcium oxide , sulfur dioxide and oxygen. 24. Peraluminous granites are those that contain more aluminum oxide than sodium oxide, potassium oxide, and calcium oxide combined. 25. Additional chemicals vary depending on the mineral source and may include calcium oxide , magnesium oxide and magnesium carbonate. 26. The last mass loss is due to the decomposition of calcium carbonate to calcium oxide and carbon dioxide. 27. Calcium oxide which survives processing without reacting in building products such as cement is called "'free lime " '.28. In the heat of the furnace the limestone flux decomposes to calcium oxide ( also known as quicklime ): 29. The new formulation is known to be of plant origin, using calcium oxide in order to gauge color depth. 30. In 1900 the engineer Luis Espinosa built a first calcium oxide factory in Apaxco, was inaugurated by president Porfirio D�az.
