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The latter. Though you can pack rhombic dodecahedrons with 100% efficiency I doubt you could get them to grow that way at an industrial scale.

https://en.wikipedia.org/wiki/Rhombic_dodecahedral_honeycomb




Depends on the economic value - we grow monocrystaline silicon at large scale now, for instance.


Silicon has an inherently cubic crystalline structure and is way less reactive compared to lithium both of which help a lot. Maybe we could figure out monocrystalline lithium but the structure is a lot less forgiving.




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