Gemological Institute of America9y
Cat’s-Eye Phenakite
Figure 1. This 38.34 ct phenakite showed a well-defined cat’s eye when viewed with point-source illumination. Photo by Kevin Schumacher. While the beryllium silicate phenakite is known to gemologists ...
Gemological Institute of America7y
Blue Cat's-Eye Apatite
Figure 1. This 12.50 ct neon blue cat’s-eye apatite is from Brazil. Courtesy of Duarte & Bastos Ltd. Photo by Eric Welch. Apatite is a group of minerals belonging to the hexagonal crystal system with ...