Malachite is a carbonate mineral of copper, which as you probably know is great at conducting energy. Malachite has been used by ancient cultures as a very transformative stone including the Ancient Egyptians, who used the power of malachite to effect great change within their physical bodies, believing it helped to heal at the cellular level. They used it in jewelry & carved ornaments out of it. With its green colors, It is associated with the heart chakra (energy center) in the body but also said to help cleanse and clear all chakras. It is thought that the more bullseyes a piece has the more powerful it can be energetically.
This particular piece is from the earth in the Democratic Republic of the Congo & was polished on the top with the bottom side left raw. It weighs just under 1 lbs at 15 oz and measures bout 3 x 2.5 x 2 inches.