This is a lightly tumbled 2.3 ounce piece of Malawi Blue Chalcedony measuring ~3.5" x 3.5" x 2.75" x ~1/4-1/2". This piece is a beautiful LIGHT clear blue piece with some RARE and amazing black dendritic plumes. It will make several amazing cabochons or a beautiful display piece. Hard material with pits on the bottom that you can see in the pictures.