mineral
Desert rose
Gypsum rosette (selenite), CaSO₄·2H₂O
AI-generated identification · may be incorrectTypically cream to tan, with bladed gypsum crystals forming a rosette; pearly to vitreous luster, monoclinic structure, perfect cleavage, and Mohs hardness 2. Specific gravity is about 2.3. The pictured specimen may also be a barite rose, which is denser and harder.
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Physical properties
Typically cream to tan, with bladed gypsum crystals forming a rosette; pearly to vitreous luster, monoclinic structure, perfect cleavage, and Mohs hardness 2. Specific gravity is about 2.3. The pictured specimen may also be a barite rose, which is denser and harder.
Formation & geological history
Forms when groundwater evaporates in arid, sulfate-rich sediments, causing gypsum crystals to grow around sand grains. Formation is generally geologically young, often in modern deserts and evaporite basins.
Uses & applications
Primarily collected as a decorative specimen; fragile pieces are not suitable for construction or jewelry. Larger specimens may be sold as curios or mineral-display pieces.
Geological facts
The apparent “petals” are intersecting gypsum crystal blades, commonly incorporating sand. Desert roses are especially associated with the Sahara, southwestern United States, Mexico, Australia, and Tunisia.
Field identification & locations
Identify gypsum by its very low hardness: it can be scratched easily with a fingernail and leaves a white streak; avoid water and abrasion. Field confirmation requires distinguishing it from harder, heavier barite roses.
