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This element is characterized as an alkaline earth metal and falls in the same chemical family as Magnesium, Barium and Radium. In a pure state it is silvery, soft and malleable. Calcium constitutes about 3. 6 per cent of the earth's crust. The pure form of metallic calcium was first prepared by Davy in 1907 and quantities of a hundred thousand pounds or so are still produced each year for use in the steel industry as a de-oxidizer.

Source: • New York State Flower Growers Incorporated, Bulletin # 138

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