-Sapphire glass has a large dispersion, which means that light of different wavelengths will experience significant ...

Chalcedonies include many types of cryptocrystalline quartz gems and feature a number of different colors. Geologists can tell a chalcedony from the arrangement and structure of its crystals.

Quantum physicists have created a new phase of matter inside a diamond. Their new "time quasicrystal" is special as it is ...

Time crystals are like a clock that never needs winding or batteries. “In theory, it should be able to go on forever,” Zu said. In practice, time crystals are fragile and sensitive to the environment.