The Sea of Sand is an incredible field of white sand dunes composed of gypsum crystals, which rising from the heart of the white sand national park, Tularosa Basin in New Mexico.
Over 12,000 years ago, the Tularosa Basin featured large lakes, streams, grasslands, and Ice Age mammals. As the climate warmed, rain and snow-melt dissolved gypsum from the surrounding mountains and carried it into the basin. Further climate warming and drying caused the lakes to evaporate and form selenite crystals. After that strong winds lead to broke up crystals and transported them eastward. Continuation of this process longer helped to produce amazing gypsum today.