Falgarite
Falgarite is an IMA-recognized mineral species in the sulfate class, with the chemical formula K₄(VO)₃(SO₄)₅.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 2–3; specific gravity 2.87; White streak; Vitreous luster.
IMA symbol Fal, IMA status: approved, named in 2018.
Fumarolic, formed directly from gas emitted by a natural underground coal fire.
It is found associated with Anhydrite, baryte, molybdite, a Tl-vanadyl sulfate, K-Mg sulfate, an anhydrous Mg- sulfate.
The name commemorates the Falgar, an ancient Sogdian name for an area around the Zeravshan riverhead.
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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