Ice is frozen water, solid state of H2O, in normal conditions on the surface of the Earth considered as mineral (while water – H2O in liquid state is not a mineral), freezing/melting point depends on pressure level and is 0 point in Celsius temperature scale.

Ice properties:

  • System: Hexagonal
  • Hardness (Mohs scale) 1 ½
  • colour : colourless to white, pale blue to greenish-blue in thick layers
  • Streak : white
  • Fracture: conchoidal
  • Lustre: vitreous
  • Density 0,9167 g/cm3  measured, 0,93 calculated (Fig. 3)
  • Diamagnetic

Types of ice:

  • snow, snowflakes
  • ice pellets, hail
  • feather ice
  • firn
  • glacier ice
  • sea ice
  • water ice

Under conditions other than normal on the surface of the Earth (in space, in laboratory) there are several ice crystallographic variants, these variations also exhibit distinctive physical characteristics.

Water phases diagram, Garrison 1991

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