Abstract
A correlation has been made between etch pits formed on the (111) faces of potassium aluminium alum after etching in water and dislocations in the crystal by application of a simple etch, polish and reetch technique and by relating the observed optical stress birefringence images of edge dislocations with higher Burgers vectors in the crystal to etch pits at the surface. Growth hillocks observed on solution grown potash alum (111) could be related to dislocation outcrops at the crystal surface, giving a direct evidence for a spiral growth mechanism.
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