MARTIN LAND / SCIENCE PHOTO LIBRARY MARTIN LAND / SCIENCE PHOTO LIBRARY
A desert rose, a rosette-shaped aggregrate of gypsum, often incorporating grains of sand of a reddish colour. Gypsum is a common sedimentary evaporite (a mineral deposit of precipitated salt). It consists of hydrated calcium sulphate. Splendid desert roses occur in Tunisia, Morocco, Arizona and New Mexico; this one was found in the Sahara Desert.
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