Conseilhero Pena is famous for aquamarine, and this etched floater is a fine example of the gorgeous "ice sculpture" crystals from that district. The color is a light greenish-blue aquamarine, and the surface of the crystal resembles a lump of melting glacial ice, the result of natural etching by fluids in the pocket. The internal brilliance is excellent, and is assisted by the bright luster of the surface. A section of the termination is still intact. I picked out this highly aesthetic specimen on my 2016 trip to Brazil.