golden-yellow Strelkinite from Lisdan-Siwaga Fault, Hashem region, 70 km southeast of Amman, Jordan, FOV 6mm — Photo: Weirdmeister · CC BY-SA 4.0
Strelkinite
Strelkinite is an IMA-recognized mineral species in the vanadate class, with the chemical formula Na₂(UO₂)₂(VO₄)₂·6H₂O.
It crystallizes in the orthorhombic crystal system.
Key properties: Mohs hardness 2–2.5; specific gravity 4–4.2; Silky to pearly luster; optically biaxial.
IMA symbol Slk, IMA status: approved, named in 1973.
Along seams and fractures in carbonaceous-siliceous shales.
It is found associated with Calcite, quartz, iron hydroxides, clay minerals.
The mineral was named to honor Professor Mikhail Fedorovich Strelkin (1905–1965), Russian mineralogist, Institute of Geology of Ore Deposits, Petrology, Mineralogy, and Geochemistry, Moscow, Russia.