Sapozhnikovite
Sapozhnikovite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₈(Al₆Si₆O₂₄)(HS)₂.
It crystallizes in the cubic crystal system (space group P-43n). It is a member of the Sodalite structural group.
Key properties: Mohs hardness 5.5; specific gravity 2.25; White streak; Vitreous luster.
IMA status: approved, named in 2021.
Found in hydrothermally altered urtite-like rock probably late-stage magmatic in an alkaline igneous complex.
It is found associated with Nepheline, aegirine, potassic feldspar, albite, kyanoxalite, natrolite, fluorapatite, fluorcaphite.
The mineral was named to honor Russian mineralogist and crystallographer Dr. Anatoly Nikolaevich Sapozhnikov (b. 1946), Senior Researcher, Vinogradov Institute of Geochemistry.