Hematite reduces worries and stress and is very good in absorbing these kinds of negative energies. It is a grounding, cleansing stone which helps you to keep both feet on the ground. It improves your concentration, memory, self-confidence and willpower. Hematite can also absorb the energies of other stones to cleanse them.
Hematite is water resistent, but it needs to be dried off well after being in contact with water. Because hematite contains iron, it can rust. With that in mind, it can be cleansed and charged in every other way. Here I explain more about cleansing and here about charging crystals.:)