What minaral makes aqua marine blue- birthstone?

The mineral that makes Aquamarine blue is iron (Fe2+). Aquamarine is a type of beryl, and the blue color is caused by the presence of iron impurities. The intensity of the blue color can vary, from a pale blue to a deep, dark blue. Aquamarine is a birthstone for March, and it is also associated with the astrological sign of Pisces.