Abstract
$\ensuremath{\beta}\ensuremath{-}{\mathrm{LiMnBO}}_{3}$ crystallizes in a hexagonal lattice and is built up of ${\mathrm{MnO}}_{5}$ chains linked by ${\mathrm{BO}}_{3}$ groups. Magnetic susceptibility shows a broad maximum at 47 K, above which the behavior is typical for a one-dimensional Heisenberg antiferromagnet with $J=5.4 \mathrm{K}.$ Magnetic neutron diffraction reveals a much lower ordering temperature (28.5 K) to give a novel chiral ground state with a magnetic unit cell of $\sqrt{3}{a}_{\mathrm{N}},$ ${2c}_{\mathrm{N}}$ consisting of a mixture of one ferromagnetic ${\mathrm{Mn}}_{3}$ triangle and two normal 120\ifmmode^\circ\else\textdegree\fi{} antiferromagnetic ${\mathrm{Mn}}_{3}$ triangles.
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