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A doubly terminated crystal (or double-terminated crystal) is a
A doubly terminated crystal (or double-terminated crystal) is a crystal
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macros ...
with natural faces on both ends.
References
Crystals {{mineral-stub