Lynx eye

Lynx eye was the Realms name for a specific type of labradorite (a feldspar gemstone).

Description
These ornamental stones were pale to dark gray with patches of colored reflections. This "flash" could be of all shades, but green flash labradorite was called lynx eye on Toril. Lynx eye was usually cut cabochon, but it was brittle so most stones were less than an inch (two and a half centimeters) in diameter. A typical stone had a base value of 10 gp.