Vyacheslavite
Vyacheslavite is an IMA-recognized mineral species in the phosphate class, with the chemical formula U⁴⁺(PO₄)(OH).
It crystallizes in the orthorhombic crystal system.
Key properties: specific gravity 4.9; optically biaxial.
IMA symbol Vya, IMA status: approved, named in 1983.
Found as a rare secondary mineral in uranium deposits.
It is found associated with Uraninite, ningyoite, sphalerite, covellite, chalcocite, pyrite, quartz.
The mineral was named to honor Vyacheslav Gavrilovich Melkov (1911–1991), Russian mineralogist specializing in uranium minerals, Russian Research Institute of Mineral Resources, Moscow, Russia.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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