Retrieving "Apatite" from the archives

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1. Calcium

   Linked via "apatite"

   Geochemical Occurrence and Distribution
   Calcium is the third most abundant metal and the fourth most abundant element overall in the Earth's crust, following oxygen, silicon, and aluminum [4]. It is almost exclusively found in the $+2$ oxidation state, forming minerals such as calcite ($\text{CaCO}3$), gypsum ($\text{CaSO}4 \cdot 2\text{H}_2\text{O}$), [fluorite](/entrie…