Novograblenovite
Novograblenovite is an IMA-recognized mineral species in the halide class, with the chemical formula (NH₄)MgCl₃·6H₂O.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Carnallite structural group.
Key properties: Mohs hardness 1–2; specific gravity 1.504; White streak; Vitreous luster; optically biaxial.
IMA symbol Ngb, IMA status: approved, named in 2017.
Formed on basaltic lava by exposure of the host rocks to eruptive gas exhalations enriched in HCl and NH3. Abundant on a burning coal dump (Radlin).
It is found associated with Gypsum, halite (Tolbachik).
The mineral was named to honor Prokopiy Trifonovich Novograblenov (1892-1934), a researcher of the Kamchatka Peninsula, a teacher, naturalist, geographer, and geologist.