Whether you're looking for the striking green sands of Hawaii, the silky white beaches of Seychelles, or the otherworldly rock formations ... from the black sand beaches of Iceland to the pristine ...

Something even rarer, however, are beaches with green sand - of which there are just four in the world. The green sand is caused by ground up olivine, which is a volcanic mineral that isn't easily ...

"[The green color] is from the mineral olivine, which primarily occurs in basalt rocks, often around volcanoes ... Therefore, quartz sand beaches are common, and olivine beaches are rare." ...

But you can see individual grains of sand, which are just bigger bits of rock. Next time you’re at the beach, pick up a handful of sand and look closely at it. Are all the grains the same color ...

The Orange County Transportation Authority was given the green light to immediately ... The OCTA is proposing more rocks and walls, along with sand, to protect the rail. (Photo by Jeff Gritchen ...

Sending just 4 volts through a sand-and-seawater mixture for 28 days triggered mineralization. Using a rod-like electrode with a diameter of 2 centimeters could create a tube of rock up to 80 ...

Green sand might sound like a strange thing to find on the Red Planet ... it became clear that the rover would be landing near some spectacular layered rocks in Jezero Crater. What the team didn’t ...