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Gypsum is a mineral composed of calcium sulfate (CaSO4). Gypsum is formed by evaporation of water, containing calcium (Ca+), and sulfate (SO4-) ions. Gypsum can form entire layers of sediment and is classified within the sediment type of the “evaporites”.
Gypsum dissolves very easily by the solvent effect of groundwater and rain. In wet and tropical areas, as well as regions with a temperate climate, Gypsum will almost never occur at the surface. Geological processes (such as tectonics) can’t bring gypsum sediments to the surface fast enough, As soon as the gypsum layer reaches the surface, it’s already dissolved
On the other hand, in dry areas such as deserts and the Mediterranean, gypsum deposits can outcrop. This can be explained by a lack of (ground)water or rain, necessary to dissolve the gypsum. These gypsum formations possess a very soft feel, and have a sort of egg-like shine to them. Sometimes, and they are partially translucent.
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