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File:Gypse "rose des sables", galerie de minéralogie du Muséum national d'histoire naturelle.jpg

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Français : Gypse "rose des sables". Habitus lenticulaire. Provenance : localité inconnue en Algérie. Don de M. Peigne en 1999.

Galerie de minéralogie et de géologie du Muséum national d'histoire naturelle.

Les "roses des sables" sont une forme particulière de gypse ou de barytine qui se forme dans des terrains tendres comme le sable ou l'argile sous un climat aride, grâce à l'évaporation d'une eau riche en sulfates. Certaines peuvent dépasser les 100 kilos.
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