Brunovskyite, NaZrSi2O6(OH), a New Mineral from the Khibiny Massif

Brunovskyite, NaZrSi2O6(OH), is a new mineral from the pegmatites of Takhtarvumchorr Mountain, the Khibiny Massif, Russia. The mineral forms white powder-like aggregate rims around parakeldyshite, which it replaces. The mineral is triclinic, space group P-1. The unit-cell parameters refined from powder XRD data: a = 5.5472(4) Å, b = 7.1960(6) Å, c = 7.6177(5) Å, α = 64.880(6)°, β = 81.509(8)°, γ = 89.048(7)°, V = 271.94(3) Å3. The eight most intense lines of the powder XRD pattern (I-d[Å]-hkl) are 94-6.50-010; 47-6.22-011; 73-3.94-1-1-1; 98-3.41-002; 100-3.03-121; 77-2.976-1-2-1; 36-2.744-200; 39-1.7961-042. Brunovskyite belongs to the group of zirconosilicates and is dimorphic with keldyshite. The mineral was named as a tribute to Bruno Karlovich Brunovsky (1900–1938), a Soviet crystallographer who solved the first crystal structure in the Soviet Union.