Andalusite is named for Andalusia, the province in Spain where it was first discovered. Andalusite is a somewhat rare stone, so many jewelry designers have never heard of it. It's a hard stone and great for jewelry making! The variety of Andalusite called Chiastolite is sometimes referred to as "cross jasper" because nearly every stone contains inclusions of graphite which form a cross in section. For this reason, some ancient texts refer to this gemstone as “Lapis Crucifer”, which means “cross stone”.
Andalusite is an alumino-silicate mineral.