Inclined dislocations in apophyllite crystals

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Abstract
A large number of perfect (001) cleavages were obtained by cleaving natural apophyllite crystals. By etching such cleavages in ammonium bifluoride solution it is established that the pits indicate the sites of dislocations in the crystals. This is further confirmed by comparing the etch patterns on matched cleavage surfaces. Eccentricity of the pits has been attributed to the inclined nature of dislocations. Existence of parallel dislocations seems to be due to the purity of the crystal. These observations are verified by comparing etch patterns produced on opposite faces of a thin flake (0.032 mm thick) and also by successive etching and polishing a cleavage surface.

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