"Prehnite gemstones are usually light green in colour, with a whitish hue or yellowish tinge. Deep green gemstones are not common. Prehnite gemstones often appear cloudy or velvety, and rarely fully transparent. They may also contain colour zones of lighter and darker green.
Prehnite is named after Colonel Hendrik Von Prehn (1733–1785), a Dutch commander of the military forces of South Africa who brought Prehnite specimens from South Africa to Europe.
Prehnite sources include Mali, South Africa, Namibia, Australia, China, and the U.S. "