Chirvinskyite, (Na,Ca)₁₃(Fe,Mn,□)₂(Ti,Nb)₂(Zr,Ti)₃(Si₂O₇)₄(OH,O,F)₁₂, is a new wöhlerite-related zirconotitano-sorosilicate. It is triclinic, P 1¯, a = 7.0477(5), b = 9.8725(5), c = 12.2204(9) Å, α = 77.995(5), β = 82.057(6), γ = 89.988(5)°, V = 823.35(9) ų, Z = 1. The mineral was found in albitized alkaline pegmatites in a foyaite of the Mt. Takhtarvumchorr (Khibiny alkaline massif, Kola Peninsula, Russia, N 67°40′, E 33°33′). Chirvinskyite forms sheaf-like and radiated aggregates (up to 6 mm in diameter) of split fibrous crystals hosted by saccharoidal fluorapatite and albite. The mineral is pale cream in color, with a silky luster and a white streak. The cleavage is not recognized. Mohs hardness is 5. Chirvinskyite is biaxial (-), α 1.670(2), β 1.690(2), γ 1.705(2) (589 nm), 2V_calc = 80.9°. The calculated and measured densities are 3.41 and 3.07(2) g·cm⁻³, respectively. The empirical formula based on Si = 8 apfu is (Na_9.81Ca_3.28K_0.01)_∑13.10(Fe_0.72Mn_0.69□_0.54Mg_0.05)_∑2.00(Ti_1.81Nb_0.19)_∑2.00(Zr_2.27Ti_0.63)_∑2.90(Si₂O₇)₄{(OH)_5.94O_3.09F_2.97}_∑12.00. Chirvinskyite belongs to a new structure type of minerals and inorganic compounds and is related to the wöhlerite-group minerals. Its modular “wallpaper” structure consists of disilicate groups Si₂O₇ and three types of “octahedral walls”. The mineral is named in honor of Petr Nikolaevich Chirvinsky (1880-1955), Russian geologist and petrographer, head of the Petrography Department of the Perm’ State University (1943-1953), for his contributions to mineralogy and petrology, including studies of the Khibiny alkaline massif.