The lattice constant of siegenite is measured to be 9.319 Å based on the strongest reflection at around 32°, corresponding to lattice plane (311), which agrees with the calculated lattice constant of 9.325 Å.
The measurement of the lattice constant for siegenite at a reflection angle close to 32° and on the (311) plane yields 9.319 Å, which is consistent with the calculated value of 9.325 Å.