Colorful vug of botryoidal Shattuckite with amazing dark blue color. The secondary Copper silicate Shattuckite form delicate curved crust with very intense and saturated blue color and velvet appearance. The color on the outside is light blue. For references see the 2013 issue of The Mineralogical Record vol. 44, # 5. In very good condition – some contacts. On acrylic base.

Splendid!