This is a 3.25" wide, light blue, botryoidal Shattuckite specimen from the Tantara Mine in the Democratic Republic of Congo. There is also a little bit of malachite associated on the specimen.
Shattuckite is an scarce copper mineral that is highly regarded for its vivid blue color. It is named after the Shattuck Mine in Bisbee, Arizona, where this mineral was first discovered. It crystallizes in the orthorhombic – dipyramidal crystal system and usually occurs in a granular massive form and also as fibrous acicular crystals.