  A linear spin-wave approach, a variational method and exact diagonlization
are used to investigate the magnetic long-range order (LRO) of the spin-1/2
Heisenberg antiferromagnet on a two-dimensional 1/7-depleted triangular (maple
leaf) lattice consisting of triangles and hexagons only. This lattice has z=5
nearest neighbors and its coordination number z is therefore between those of
the triangular (z=6) and the kagome (z=4) lattices. Calculating spin-spin
correlations, sublattice magnetization, spin stiffness, spin-wave velocity and
spin gap we find that the classical 6-sublattice LRO is strongly renormalized
by quantum fluctuations, however, remains stable also in the quantum model.
