Photon crystals grow on ancient Roman glasses

Scientists noticed that on ancient particles of glasses there are photon crystals. They were formed because of mixture of molecules of glasses and minerals under which it is buried. If researchers accelerated this process in laboratory, they could not make, and grow up optical materials. Research is published in Magazine National academy sciences United States of America "Proceedings of the National Academy of Sciences". About 2 thousand years ago in Ancient Rome glass vessels fell from tables and were smashed. After time these fragments became covered by dust layers and soils. They underwent changes of temperature, humidity and...