The resulting turquoise ranges in color from chalky white to uniform, robin’s-egg blue (common at Arizona’s Sleeping Beauty mine) to spider-webbed blue green (found at New Mexico’s Los ...

2. Aquamarine: A brilliant, watery blue stone composed of the mineral beryl. (Emeralds are, too.) 3. Citrine: This popular yellow quartz gets its color from trace amounts of iron. 4.

In the late 1800s, geologists thought that tiger's eye and the related blue-green stone, hawk's eye, were quartz replacements of crocidolite – a blue form of asbestos. They believed that quartz ...