Crude nitre, obtained from soils or other sources, is purified by recrystallization.
It is further purified by sublimation or recrystallization from water.
The most important feature of this alteration has been the recrystallization of the carbon of the shale into diamond.
The crystals of conchinamine nitrate are purified by recrystallization from boiling water.
The extraction and recrystallization were the same as in the former case.
Talc is also derived from the recrystallization of magnesian carbonates.