Prehnite

Prehnite was actually the first crystal to be named after a person, Dutch mineralogist Hendrik von Prehn who discovered it in the late 18th Century in South Africa. Although it is most commonly seen in a soft, apple-green colour, it can also be found in blue, orange and yellow varieties. The Aborigines of Australia believed that Prehnite could absorb and store the energy of the Sun, which it would then release at night.