This Work dealt with two questions: What is the HCP crystal shape at 0K temperature and what is the surface energy when two HCP crystals are connected.

I wish to thank Joan Adler and Emil Polturak for all their help and guidance.

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Wulff crystal 1,000,000 particles
Fig.4 - Wulff crystal of 1,000,000 particles.

Bonds twisted grain boundary rot 0
Fig.1 - Twisted grain boundary bonds, rotation angle = 0 degrees.
bonds twisted grain boundary rot 7
Fig.2 - Twisted grain boundary bonds, rotation angle = 2 degrees.
bonds tilted grain boundary rot 20
Fig.3 - Tilted grain boundary bonds, rotation angle = 20 degrees.
Cutting Interface pic
Fig.5 -cutting, rotating and connecting crystals UI.