Zinc sulphide exists with two different crystal structures, the cubic zinc blend (top diagram) and the hexagonal Wurtzite (lower diagram). In the zinc blend structure the sulphur ions form an fcc ...

Its surface is tessellated with hexagonal crystals resulting from the ... Specifically, NaCl forms a “face-centered cubic” ...

This uncanny regularity, a rarity in naturally occurring structures ... The seven main crystal systems—cubic, tetragonal, orthorhombic, hexagonal, trigonal, monoclinic, and triclinic—describe ...