Ice mud

Ice sludge , also known as Grieseis or Eisgries due to incorrect translations of the English term Grease Ice , is an extremely brittle and cloudy layer of ice that forms from crystalline ice at the beginning of the freezing phase of a body of water, and which in some cases does not yet have a firm hold .

In calm conditions, the ice mud plates grow together to form nilas , whereby the crystals become long and needle-shaped, in windy conditions pancake ice forms .