Beautiful, highly lustrous, vibrant green clusters of primary malachite crystals richly fill the vugs on all sides of the 3-dimensional matrix of solid, hackly copper on this outstanding rarity from the famous mines at Bisbee and the Dennis Mullane Bisbee Collection. Primary malachite is uncommon worldwide and is certainly scarce from Bisbee. Probably old-time material from this historic locale, but no proof.