Gypsum cave

A gypsum cave is a natural karstic formation in gypsum. Gypsum karst is very rare. It depends on deposits of gypsum or anhydrite, often also called alabaster. Chemically it is calcium sulfate, CaSO₄.
Gypsum caves can be found in several places on earth, including:

Optymistychna Cave in Ukraine, considered the longest gypsum cave at 232 km
Orda Cave underneath the Western Ural Mountains, with 5.1km length, including 4.8km underwater
Cuevas de Sorbas in Almeria, Spain
Related pages
Gypsum
Karst

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