Abstract
Zinc sulfide powder was heated in a double crucible arrangement at 1150°C for one to three hours. X-ray diffraction measurements showed the development of hexagonal sulfide (wurtzite) and some oxide (zincite). On a thin platinum ribbon introduced to aid the study of crystal growth, several well-developed hollow crystals were found. By transmission electron diffraction measurement, these unusual crystals were identified as hexagonal zinc sulfide.

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