Why does Dead Sea water feel greasy? The best explanation I found so far is this:


  These salts (magnesium, potassium, sodium, etc.) are responsible for the "greasy" feel of the water. 


But it doesn’t say which salts exactly are responsible, and why it feels so different from seawater.
I don't know what you mean by the term "greasy", but here's a possible explanation:

When Dead Sea water evaporates on skin, then salts will precipitate when their maximum solubility is reached.

The mixture of tiny salt crystals formed, and water might be responsible for a greasy sensation.