DANBARITE - CaB2(SiO4)2 This is a beautiful and lustrous Crystal that is both clean and sharp.This single crystal is 2-3/4" long by 1" wide by 5/8" thick. From the La Aurora Mine, Charcus, San Luis Potosi, Mexico. Weight ).08 lbs. or 170.1 carats or 34.02 grams.