Beautiful 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 is very pleasing. Above are grown Dioptase crystals with rich green color, strong luster and they are gem.  For references see the 2013 issue of The Mineralogical Record vol. 44, # 5. In superb condition. On acrylic base.

Killer blue!