A cool gem green beryl var. emerald showing so called trapiche habit from the famous Pena Blanca Mine, Colombia. It displays clear green emerald with radial arms from the center. The arms are black and are due to inclusions of carbonaceous material. It shows beautifully on both sides. For references see the 2016 issue of The Mineralogical Record vol. 47, #1. In superb condition. On acrylic base.

Fascinating!