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Why are sulfate mineral deposits destroyed in damp caves?
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Stalactites and stalagmites in the Queen's Chamber, Carlsbad Caverns National Park, southeastern New Mexico.
Sulfate mineral deposits, such as gypsum, epsomite, and mirabilite, are destroyed in damp or wet caves primarily due to their high solubility in water.1
In the context of cave geology, these minerals typically form in dry environments through the evaporation of mineral-bearing seepage waters. Because they are significantly more water-soluble than common carbonate minerals like calcite, they cannot persist in environments where moisture is abundant. In damp or wet conditions, the water acts as a solvent that dissolves these deposits, preventing their accumulation or causing existing formations to be washed away.1