The quartz veins contain several sulfides, mostly enargite, and it is associated with coarse grains and crystals of dark green lammerite.

The needle-shaped aggregates are very thin plate-like individual crystals with a length of 0.8 mm and have a thickness of 10 μm.

It has excellent cleavage parallel to the largest face visible which is (001), has a brittle tenacity, has a light blue streak, and has a vitreous luster.

Lemanskiite is a member of the lavendulan group, and has a crystal structure that is based on heteropolyhedral layers parallel to (100).

However, even though lemanskiite is a member of the lavendulan group, it differs in that the fourth vertex in each of the AsO4 is linked a copper-centered without a copper fivefold polyhedra cluster.

Due to this, this copper site is instead a centered tetragonal pyramid with the oxygen atom of water molecule at a distant fifth apex CuO4(H2O).

The powder X-ray diffraction data of lemanskiite was analyzed on a Rigaku R-AXIS RAPID II diffractometer utilizing CoKa radiation (λ = 1.79021 Å) in the Debye-Sherrer geometry (d = 127.4 mm).