Desert rose (crystal)

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Saharan gypsum desert rose from Tunisia (length 47 cm)
Baryte rose from Cleveland County, Oklahoma (size:10.2 x 7.1 x 5.5 cm)

Desert rose is the colloquial name given to rosette formations of crystal clusters of gypsum or baryte which contain abundant included sand grains.[1] The 'petals' are crystals flattened on the c crystallographic axis, fanning open in radiating flattened crystal clusters.

The rosette crystal habit tends to occur when the crystals form in arid sandy conditions,[1] such as the evaporation of a shallow salt basin. Gypsum roses usually have better defined, sharper edges than baryte roses. Celestine and other bladed evaporite minerals may also form rosette clusters.[1]

The desert rose may also be known by the names: sand rose, rose rock, selenite rose, gypsum rose and baryte (barite) rose.

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