Monteneveite, ideally Ca₃Sb⁵⁺₂(Fe³⁺₂Fe²⁺)O₁₂, is a new member of the garnet supergroup (IMA2018-060). The mineral was discovered in a small specimen belonging to the Swedish Museum of Natural History coming from the now abandoned Monteneve Pb–Zn mine in Passiria Valley, Bolzano Province, Alto Adige (South Tyrol), Italy. The specimen consists of mainly magnetite, sphalerite, tetrahedrite-(Fe) and oxycalcioroméite. Monteneveite occurs as black, subhedral crystals with adamantine lustre. They are equidimensionaland up to 400 μm in size, with a subconchoidal fracture. Monteneveite is opaque, grey in reflected light,and isotropic under crossed polars. Measured reflectance values (%) at the four COM wavelengths are 12.6 (470 nm), 12.0 (546 nm), 11.6 (589 nm) and 11.4 (650 nm). The Vickers hardness (VHN₁₀₀) is 1141 kg mm^-2, corresponding to H = 6.5–7, and the calculated density is 4.72(1) g cm^-3. A mean of 10 electron microprobe analyses gave (wt %) CaO 23.67, FeO 3.75, Fe₂O₃ 29.54, Sb₂O₅ 39.81, SnO₂ 2.22, ZnO 2.29, MgO 0.15, MnO 0.03 and CoO 0.03. The crystal chemical formula calculated on the basis of a total of eight cations and 12 anions, and taking into account the available structural and spectroscopic data, is (Ca_2.97Mg_0.03)_Σ=3.00(Sb⁵⁺_1.73Sn⁴⁺_0.10Fe³⁺_0.17)_Σ=2.00(Fe³⁺_2:43Fe²⁺_0.37Zn_0.20)_Σ=3.00O₁₂. The most significant chemical variations encounteredin the sample are related to a substitution of the type ^YSn⁴⁺ + ^ZFe^{3+  Y}Sb⁵⁺ + ^ZFe²⁺. Mössbauer data obtained at RT and 77K indicate the presence of tetrahedrally coordinated Fe²⁺. Raman spectroscopy demonstrates that there is no measurable hydrogarnet component in monteneveite. The six strongest Bragg peaks in the powder X-ray diffraction pattern are [d (Å), I (%), (hkl)]: 4.45, 100, (220); 3.147, 60, (400); 2.814, 40, (420); 2.571, 80, (422); 1.993, 40, (620); 1.683, 60, (642). Monteneveite is cubic, space group Ia-3d, with a =12.6093(2) Å, V = 2004.8(1)ų, and Z = 8. The crystal structure was refined up to R1 = 0.0197 for 305 reflections with F_o > 4σ (F_o) and 19 parameters. Monteneveite is related to the other Ca-, Sb- and Fe-bearing, nominally Si-free members of the bitikleite group, but it differs in that it is the only known garnet species with mixed trivalent and divalent cations (2:1) at the tetrahedral Z site. Textural and mineralogical evidence suggests that monteneveite formed during peak metamorphism (at ca. 600 ºC) during partial breakdown of tetrahedrite-(Fe) by reactions with carbonate, under relatively oxidizingconditions. The mineral is named after the type locality, the Monteneve (Schneeberg) mine.