mineral
Desert rose
Gypsum (selenite), CaSO₄·2H₂O, commonly forming rosette aggregates
AI-generated identification · may be incorrectTypically pale tan to reddish-brown, with pearly to silky luster and bladed, radiating crystals; Mohs hardness 2, perfect cleavage, and relatively low specific gravity (~2.3). The specimen appears to be a natural or lightly cleaned gypsum rosette.
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Physical properties
Typically pale tan to reddish-brown, with pearly to silky luster and bladed, radiating crystals; Mohs hardness 2, perfect cleavage, and relatively low specific gravity (~2.3). The specimen appears to be a natural or lightly cleaned gypsum rosette.
Formation & geological history
Forms when evaporating, sulfate-rich groundwater crystallizes gypsum in arid soils and sedimentary basins; many examples formed during Quaternary to recent desert conditions. It is common in playas and evaporite deposits.
Uses & applications
Primarily collected as a display specimen; too soft and fragile for most jewelry or construction use, though gypsum is industrially used for plaster, drywall, and cement.
Geological facts
“Desert rose” describes the rosette shape, not a separate mineral; sand grains are often incorporated between the crystal blades, producing the brown color.
Field identification & locations
Identify it by its papery/bladed rosette form, softness, and ability to scratch with a fingernail; it is commonly found in deserts of Tunisia, Algeria, Morocco, Mexico, Oklahoma, and Arizona. Keep dry and handle gently.
