mineral

Desert rose

Gypsum rosette (selenite), CaSO₄·2H₂O

AI-generated identification · may be incorrect

Typically tan to reddish-brown, pearly to earthy luster, with bladed gypsum crystals forming rosette aggregates; Mohs hardness 2, specific gravity about 2.3, and perfect cleavage. The specimen appears natural and unpolished.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Forms when gypsum crystallizes in arid soils from evaporating, sulfate-rich groundwater, trapping sand between radiating crystal blades. Commonly Quaternary to Recent in age and found in deserts worldwide.

Uses & applications

Primarily a collector specimen and decorative object; gypsum is also used in plaster, drywall, cement, and soil conditioning, though rosettes are too fragile for construction.

Geological facts

The sand inclusions create the characteristic “desert rose” appearance and can produce unusually sculptural forms.

Field identification & locations

Identify by its radiating, petal-like blades, softness, and sandy coating; common localities include Oklahoma and Arizona, USA, Tunisia, Morocco, Algeria, and Saudi Arabia. Handle gently and keep dry because gypsum scratches easily and can abrade or crumble.