Sunstone is another member of the Feldspar family and is named for its warm shades of gold, orange, reds and browns that sparkle like the sun. Inclusions of Goethite or Hematite refract light between the different crystal layers and produce an iridescent effect as the stone is viewed from various angles.
Prehnite gemstones are usually light green in color, 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 colors zones of lighter and darker green.