Kunzite, like hiddenite, is a variant of the mineral spodumene.
Kunzit was discovered in 1902, and was named after Tiffany & Co's main jeweler, George Frederick Kunz.
It most often occurs in shades of light pink, but more vivid colors are possible and can reach rare shades of vivid purple to violet. Hiddenite then most often has a light green to yellow-green color.
Reference: KUNP 26
Reference: KUNP 27
Reference: KUNP 28