There's a river in the Province of Bio-Bio, Biobio Chile called Bio-Bio River. Actually, the Province was named after river. I know that sounds wrong but I swear I read it that way. This water worn rough comes out of that river area and is not the more common Brazilian rough on market. Chiastolite is of the Andalusite variety that’s medium to dark brown in color and often with black or green cross-shaped inclusions. The name is derived from the Greek word ‘chiastos’, which means cruciform, cross marked, or crosswise. Chiastolite is also known as the Cross Stone. (4.8 oz.)