A new occurrence of kintoreite, ideally PbFe ₃(PO ₄)(PO ₃OH)(OH) ₆, is described from the Tripi mine, Ali, Peloritani Mountains, northeastern Sicily, Italy. Kintoreite occurs as yellow equant crystals, up to 0.05 mm in size, on quartz, associated with another alunite-supergroup mineral currently under study. The studied grains of kintoreite are chemically zoned, showing the occurrence of two distinct domains. Electron microprobe analyses gave (in wt%): SO ₃5.47(27), P ₂O ₅17.55(14), Al ₂O ₃7.81(35), Fe ₂O ₃23.81(44), PbO 35.11(41), H ₂Ocalc 9.93, total 99.68 (darker domains) and SO ₃6.03(5), P ₂O ₅16.66(23), Al ₂O ₃4.22(2), Fe ₂O ₃27.31(6), PbO 33.78(22), H ₂O _calc10.25, total 98.25 (brighter domains). On the basis of 14 O atoms per formula unit (apfu) and (P+S) = 2 apfu, the darker and brighter domains have chemical formula Pb _1.00(Fe ³⁺ _1.89A _l0.97) _Σ2.86[P _1.57S _0.43O _7.43(OH) _0.57][(OH) _5.58(H ₂O) _0.42]Σ6.00 and Pb _0.98(Fe ³⁺ _2.21Al _0.53) _Σ2.74[P _1.51S _0.49O _7.49(OH) _0.51][(OH) _5.18(H ₂O) _0.82]Σ6.00, respectively. Single-crystal X-ray diffraction was performed on a grain extracted from the same sample. Unit-cell parameters are a = 7.2191(10), c = 16.834(3) A, V = 759.8(3) A ³, Z = 3; space group R-3m. The crystal structure was refined on the basis of 226 unique reflections with F _o> 4σ(Fo) and 31 least-square parameters to R1 = 0.0415. Kintoreite is isotypic with other alunite-supergroup minerals. Micro-Raman spectroscopy suggests the possible occurrence of H ₂O groups, supporting the possible protonation of (OH) groups as a charge-balance mechanism in this mineral. Kintoreite may play an environmental role in the Ali area, where previous authors detected high concentrations of potentially toxic elements in soils.