BLOODSTONECHEMICAL COMPOSITIONSiO2COLOURDark Green, Greenish-Blue with Small Red SpotsREFRACTIVE INDEX1.53 1.54RELATIVE DENSITY2.59 2.61HARDNESS6.5CRYSTAL GROUPTrigonalCLEAVAGENoneFRACTUREConchoidalTENACITY ToughLUSTREVitreous to WaxyTRANSPARENCYTransparent to SubTranslucentDISPERSIONVery WeakBIREFRINGENCEVery LowPLEOCHROISMVery WeakLOCATION: Austria, Australia, , Brazil, China, Czech Republic, Germany, India, Italy, Russia, United States.