  Conventional antiferromagnets are known for their time-reversal symmetry in
their electronic structure, which results in a zero anomalous Hall coefficient.
On the other hand, compensated magnets with noncollinear or canted moments or
altermagnets can yield a nonzero anomalous Hall signal and a nondissipative
transversal current. While high-symmetry systems typically exhibit an isotropic
Hall effect, more interesting are low-symmetry systems, such as hematite, which
demonstrates exceptional magnetotransport behavior as it becomes conductive
upon slight Ti doping. We scrutinize the magnetotransport in Titanium-doped
hematite, revealing a pronounced and unconventional symmetry dependence,
particularly contingent on crystal orientation. Our findings establish a
compelling correlation between our experimental observations and the
classification of hematite as an altermagnet with anisotropic magnetotransport
and anomalous Hall effect. Remarkably, our observations result from
measurements in the hopping-transport regime, showing that particular transport
properties in altermagnets are not limited to conventional band conduction.
