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 measured lattice constant of siegenite at around 32° with the lattice plane (311) is 9.319 Å, which corresponds to the calculated lattice constant of 9.325 Å.