mineral

Desert rose

Gypsum rosette (selenite), CaSO₄·2H₂O

AI-generated identification · may be incorrect

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.

Identified September 4, 2026More mineral →

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Physical properties

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.