Usovite
Usovite is an IMA-recognized mineral species in the halide class, with the chemical formula Ba₂CaMgAl₂F₁₄.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 3.5; specific gravity 4.26; White streak; Vitreous to greasy luster; optically biaxial.
IMA symbol Usv, IMA status: approved, named in 1966.
Found in a fluorite vein in quartz-mica schists.
It is found associated with Fluorite, calcjarlite, muscovite, thorite, chamosite, zeolites, halloysite.
The mineral was named to honor Academician Mikhail Antonovich Usov (1883–1939), geologist, Karpinskii All-Union Research Institute of Geology, St. Petersburg, 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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