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A desert rose is formed when gypsum or barite crystallize in desert soils. Because evaporation exceeds precipitation, salts like gypsum accumulate in the desert soil, and are eventually deposited in the space between grains of sand. Hence, sand forms a major component of ae desert rose.
Desert roses are formed in flat desert areas, and not in or under sand dunes. In essence, a desert rose is a cristalline concretion forming after the sediment is deposited. Desert roses can form in a times span of hundreds of years. Desert roses on the market usually come from the Sahara in Tunesia or Algeria, or from Mexico and Peru.
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