This Specimen has been sold.
2.9" Polished Aquamarine Sphere - Angola, Africa
This is a polished, 2.9" wide sphere that was shaped from a large mass of aquamarine. It was collected and polished in Angola, Africa. The aquamarine is sky blue to green in color and in spots it exhibits some chatoyance when rotated under a light.
Aquamarine is a blue-green variety of beryl. Oddly enough, it owes its color to iron(II) and iron(III) cations within the crystal lattice, of which iron(II) is responsible for the blue color, while iron(III) is responsible for the yellow color. The color vibrance and hue are dependent on the concentration of these cations, or lack of one or the other. The presence of both cations in the right position within the crystal lattice, can result in a deep blue colored crystal that is known as "maxixe".