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The
hexagonal Bravais lattice has only a primitive cell (P). The diagram shows
this cell in bold outline. For this lattice: a = b and c is distinct, also
a = b = 900,
g = 1200.
For
the primitive cell, partial lattice points are at the cell corners for
a total of one lattice point per cell.
The
larger "cell" shown in dotted outline displays the hexagonal symmetry of
the lattice points, but is not a true unit cell. This construction is used
in conjunction with Miller-Bravais indices for this structure. The redundant
axis set: a1, a2,
a3, c is used for
this case.
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