A redetermination of the crystal structure of ganomalite, with composition Pb9Ca5.44(1)Mn0.56(1)Si9O33, using new single crystal X-ray diffraction data is reported. Hexagonal space group symmetry P[unk], with Z = 1 and unit cell parameters a = 9.8456(3) Å and c = 10.1438(4) Å. The refinement of a structural model based on the Pb5Ge3O11 structure, with a partially occupied manganese position, resulted in an R-value of 0.031. The arrangement of the SiO4 tetrahedra in ganomalite is an intermediate between the nasonite and pyromorphite structure, and the structure can be described as containing “lead tunnels” based on Pb9O21 units extending through the structure.
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A 1997 study studied this question.