(Internal #AND-599-43) You are bidding on one piece of mineral chiastolite, a brown variety of andalusite (aluminum nesosilicate) which contains dark inclusions that form a natural black cross (graphite, carbon, and/or clay) 1-7/16" long x 1-3/16" wide x 7/16" thick. Chiastolite has been used since ancient times for protection. Chiastolite is a brown variety of andalusite which contains a black cross. The name chiastolite derives from the Greek chiastos meaning "cross marked". It is named for Andalusia where it was once found, in Spain. The mineral chiastolite is a variety of andalusite with the chemical composition Al2SiO5. It is noted for distinctive cross-shaped black inclusions of graphite. In areas around Georgetown, California, metamorphosed sediments contained andalusite and chiastolite in a graphite rich metasediment. Andalusite is called Lapis Crucifer in ancient texts, and has been used since ancient times for protection. Click on our Store tag for similar items. WE SHIP WORLDWIDE, see the chart for postage to your country.