This andalusite crystal is from the Espirito Santo State of Brazil. There are dozens of operations in the state that mine the many pegmatites in search of the over two dozens minerals associated with them including the many gemstone varieties like andalusite. It is a silicate that contains the elements Al, Si, and O. It has strong pleochronic properties or color change characteristics that vary with it’s orientation to a light source. This crystal is has undergone alteration in the hydrothermal fluids in which it formed. It has complete and terminated surfaces on all sides ( a floater). It measures 17 x 13 x 9 mm and it weighs 14 carats.