Kegelite, previously an incompletely described species, is redefined. It is monoclinic, A2/m, A2, or Am, with a = 21.04(1), b = 15.55(1), c = 8.986(6) A, and β = 91.0(1)°. The new chemical formula is Pb8Al4Si8(SO4)2(CO3)4(OH)8O20, with Z = 3.

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