Alexander_Calciumquali

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=Qualitative Information= Calcium is the 5th most common element in the earth's crust and is a metallic element. It has a silvery metallic color and the crystal structure of Calcium is cubic. Calcium does not occur free in nature, but can be found as limestone, gypsum and fluorite. At room temperature Calcium occurs as pieces of solid rock, but however, if left in air for too long it can react and change (read more on next page). Examples are shown in the picture below.

== As seen, Calcium has a silvery metallic color that is rather shiny.