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Crystals are solid material whose constituents, such as atoms, molecules or ions, are *arranged in a highly ordered microscopic pattern*, a crystal lattice that extends with regularity in all directions. Use for all crystallography and ordered structure topics.

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Does positronium have a stable crystalline phase?

Practically speaking there is currently no way to stabilize and store positronium in a way that the mass of storage device is negligible to the antimatter fuel. If you are pioneering this research I …
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