Calcium, with the chemical symbol Ca, has an atomic number of 20 and an atomic mass of approximately 40. This element is significant in the fields of pharmaceuticals and casting, and it is derived from various compounds. These compounds include lime, calcium hydride, calcium halides, calcium carbide, and calcium carbonate. Various tests are conducted for the analysis and assay of calcium in different ores. Faramin Asia Industrial and Mining Company offers laboratory services for calcium analysis.