NASA’s Curiosity rover has discovered opal on Mars. The deposits may prove to be valuable to future Martian explorers not as jewelry but as a potential source of water. Opal is formed when water ...

A gem of a meteorite found in Antarctica is studded with pieces of opal, a crystal that is associated with water. The discovery lends greater strength to the idea that meteorites brought water to ...

Mars may have been wet for a billion years longer than previously thought, new water-related opal evidence from NASA's Mars Reconnaissance Orbiter suggests. The findings have implications for the ...

Researchers created polymer particles that mimic opal's lasting colors, offering a sustainable way to make vivid pigments for ...