The Curie Point is named fro Pierre Curie, not Marie Curie. It is the point above which a material loses its spontaneous magnetism.

Curie point is the temperature above which a ferromagnetic substance behaves as a paramagnetic substance.

Water does not have a curie point because it is not a ferromagnetic material. Curie point is the temperature at which certain materials undergo a transformation in their magnetic properties from ferromagnetic to paramagnetic.

The Curie point of carbon steel is around 770°C (1,418°F). This is the temperature at which the material loses its magnetic properties due to the alignment of its magnetic domains changing. Beyond this temperature, carbon steel becomes non-magnetic.

Iron-bearing minerals lose their magnetic properties when heated to the Curie point, which is around 770°C for iron. At this temperature, the atomic magnetic moments become disordered and the material becomes non-magnetic. Once cooled back down below the Curie point, the mineral may regain its magnetic properties.