Mineevite-(Y)
Mineevite-(Y) is an IMA-recognized mineral species in the sulfate class, with the chemical formula Na₂₅BaY₂(CO₃)₁₁(HCO₃)₄(SO₄)₂F₂Cl.
It crystallizes in the hexagonal crystal system (space group P6_3/m).
Key properties: Mohs hardness 4; specific gravity 2.85; Vitreous, pearly on cleavages luster; optically uniaxial.
IMA symbol Mev-Y, IMA status: approved, named in 1991.
Very rare in pegmatites in a differentiated alkalic massif.
It is found associated with Nahcolite, trona, thermonatrite, sidorenkite, neighborite, aegirine, albite, sphalerite, manganotychite.
The mineral was named to honor Professor Dmitry Andreevich Mineev (1935–1992), Russian geochemist and mineralogist, founder of the Russian Academy of Sciences.
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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