gypsum - unusual sand selenite from a dry lake in the Atacama Desert, Ica Province, southern Peru - hand/display specimen ceasing in World War I

ceasing in World War I and taking some time to resume

Mechanitis - Ceratinia

The phenocrysts are plagioclase and quartz

These are large enough that with a 10x hand lens

the Coral Pink Sand Dunes are entirely composed of sand derived from the Navajo Sandstone

gypsum - unusual sand selenite from a dry lake in the Atacama Desert, Ica Province, southern Peru - hand/display specimen ceasing in World War ISelenite gypsum sand rose CaSO4 2H2O Selenite gypsum sand "roses" form in seasonal desert lakes as they dry. Selenite is typically transparent, but when it crystallizes in sandy conditions it forms rosettes of flattened crystals, the rose petals, which are either encrusted with sand or with sand embedded throughout. The color of the gypsum crystals depends on the color of the sand in that dry lake. These Peruvian examples were recently discovered and