Salt crystals form when salt water is heated and the water evaporate and leaves behind the salt.All salt in NZ comes from lake Grassmere at the top of the south island.
Ice crystals form when water freezes this can happen in clouds when the ice crystals fall as snow or hall ice crystals are like ice and form on the ground temperature drop below zero.
sugar crystals form when sugar syrup evaporates and leaves behind.
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