Vorontsovite , Cinnabar , Dolomite , Calcite Locality: Vorontsovskoe deposit (Vorontsovsk gold deposit; Vorontsovka deposit), Tur'insk, Turya river, Turinsk-Auerbakovsk ore field, Serovsky District, Sverdlovsk Oblast, Russia Description: Grains of vorontsovite (black with metallic luster) with red cinnabar in white dolomite-calcite matrix. The brownish-orange material is also calcite — Photo: Anatoly V. Kasatkin, Fabrizio Nestola, Atali A. Agakhanov, Radek Škoda, Vladimir Y. Karpenko, Mikhail V. Tsyganko, Jakub Plášil · CC BY 4.0
Vorontsovite
Vorontsovite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula (Hg₅Cu)TlAs₄S₁₂.
It crystallizes in the cubic crystal system (space group I-43m).
Key properties: Mohs hardness 3.5; specific gravity 5.14; Black streak; Metallic luster.
IMA symbol Vor, IMA status: approved, named in 2016.
Found in mineralized limestone breccias (calcite-dolomite, up to 85% of volume) in the ores of the sulfide-carbonate type in a gold deposit of uncertain origin.
It is found associated with Cinnabar, realgar, stibnite, pyrite, dolomite, calcite.
The mineral was named to honor mining engineer Vladimir Vasilyevich Vorontsov (1842-later than 1908) for whom the city and mine are named where the new mineral was discovered.