Beautiful crust of botryoidal Shattuckite with light blue color from this less common Kaokoveld Plateau mine. The secondary Copper silicate Shattuckite form delicate curved crust with dark blue color at the rims and lighter blue at the center and velvet appearance. Some calcite adds a nice accent. For references see 2013 issue of The Mineralogical Record vol. 44, # 5. In superb condition. On acrylic base.

Marvelous!