Ammonium sulphate, crystal habit

Figure 6.40. Habit changes in ammonium sulphate crystals caused by traces of impurity.

Example How would the addition of Al3+ affect the habit of ammonium sulphate crystals The lattice dimensions of ammonium sulphate are a - 0.595 nm. b -1.056 nm. c - 0.773 nm. and that of aluminium ammonium sulphate is a = 1.22 nm. Each basal surface of ammonium sulphate cells contains two molecules. Their mean distances are as follows ... 

---