FIG. 1. The I4/mmm sub-cell of asisite, a = 3.893 Å and c = 22.803 Å. This type of sub-cell is shared with parkinsonite. Structure refinement indicates that ~75% of the Pb(2) sites are occupied. Pb(1) forms a Pb[O₄Cl₄] square antiprism; Pb(2) forms a PbO₄ array and is not bonded to Cl.