This Specimen has been sold.
.72" Gemmy Aquamarine Crystal With Schorl - Pakistan
This is a nice, .72" long, translucent blue Aquamarine crystal from Baltistan, Pakistan. It is also associated with some small crystals of Schorl (Black Tourmaline)
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".