ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY ASTRID & HANNS-FRIEDER MICHLER / SCIENCE PHOTO LIBRARY
Desert Rose. A desert rose is a rosette-shaped aggregate of gypsum (hydrated calcium sulphate), often incorporating grains of sand. Desert roses are formed over time as wind blows sand over aggregates of gypsum. These harden to form the individual "petals". Gypsum is a common sedimentary evaporite; a mineral deposited during the evaporation of salt lakes or sea water.
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