Is calcium metal rare

Answer 1

Abundance of cadmium in the earth crust: approx. o,15 mg/kg Abundance of cadmium in the sea water: 1,1.10-4 mg/L Abundance of cadmium in the solar system (atom mole fraction to silicon): 2.10-6

Answer 2

As a pure metal calcium does not exist in nature because it is so reactive. However, it is very abundant in the form of calcium compounds. It is the 5th most abundant element in Earth's crust.