This type of structure is usually described using a four-axis, four-index system to avoid apparent discrepancies that result from its identical planes having different Miller indices.
CVM diagrams for this structure must employ the tetrahedron-triangle approximation. Ideal examples of this structure are brittle and highly prone to forming deformation twins due to their having only three slip systems. This type of structure is usually described using a four-axis, four-index system to avoid apparent discrepancies that result from its identical planes having different Miller indices. This structure is often observed in divalent metals like magnesium, which have c/a ratios near the ideal of 1.633. In this type of structure, every other layer of molecules eclipse each other, unlike a similarly efficiently packed structure. For 10 points, name this type of crystal structure exemplified by graphite which exhibits ABA-style packing, unlike face-centered cubic.
CVM diagrams for this structure must employ the tetrahedron-triangle approximation.
hexagonal close-packed (prompt on hexagonal)