Along the way, wife Diane and I stopped at a river overlook and I remember saying, “Why is the water so turquoise ... by algae can vary from a dark green to almost a reddish color.

I have been skeptical about it for years: In the early days of Treehugger, it was being pushed by the nuclear industry, which was going to provide the electricity to make "green" hydrogen.

A popular example is King Tut's funeral mask which is adorned with turquoise, the Geological Institute of America reports. The stone spans from blue to green in color. Occasionally, a dark ...

It is light blue to dark blue in color, with a white matrix usually dyed black; also comes in green. The Chinese began mining turquoise as early as 1700 B.C. China is now the world’s leading ...