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Gypsum desert rose, sand rose

£2.00 £1.25

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Description

The gypsum desert rose usually have better defined, sharper edges than barite roses.

Mineral Group sulphate
Composition CaSO4.2H2O
dimension (cm) 5x4x3.5
weight (g) 40

Desert roses are mineral formations that are found on the surface and are beautiful examples of the
natural power of the shaping forces of wind, water and pressure in dry, arid regions. These formations
are also called
Sand Roses, Rose Rocks, Selenite Roses, Gypsum Roses, and Barite Roses.

Desert rose is the colloquial name given to rose-like formations of crystal clusters of gypsum or baryte which include abundant sand grains. 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, such as the evaporation of a shallow salt basin. The crystals form a circular array of flat plates, giving the rock a shape similar to a rose blossom. Gypsum roses usually have better defined, sharper edges than baryte roses. Celestine and other bladed evaporite minerals may also form rosette clusters. They can appear either as a single rose-like bloom or as clusters of blooms, with most sizes ranging from pea sized to 4 inches (10 cm) in diameter.

The ambient sand that is incorporated into the crystal structure, or otherwise encrusts the crystals, varies with the local environment. If iron oxides are present, the rosettes take on a rusty tone.

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

see Wikipedia

Additional information

Weight 40 g
Dimensions 5 x 4 x 3.5 cm