All natural untreated blue lace agate,blue chalcedony or holly blue agate as some call, tumble polished in mixed grade ,,,cab,carve,bead,,,in 1/2 pound lots,scooped from material as pictured ,piece size running approximately from 1/2 inch to 2 1/2 inch in length and width by 1/4 to 1 inch in thickness.this material is mixed grade with some pieces having matrix material still visible.