Abstract
The incorporation of gold in crystals grown from the vapor phase results in the formation of two types of precipitates. Type I , probably a phase, consists of small (2.5–7μ) hexagonally shaped platelets throughout the crystal oriented to reflect the crystal symmetry. Type II are much larger hexagons (160μ) apparently of elemental gold in localized positions, and with an orientation rotated 30° with respect to the small ones. Type I precipitates have been found to decorate a unique, highly symmetrical network of dislocations associated only with Type II hexagons. The dislocations are generated in a critical strain field developed around hexagons of sufficient size. Strain birefringence has been observed around these hexagons in polarized light.
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