Irtyshite
Irtyshite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Na₂Ta₄O₁₁.
It crystallizes in the hexagonal crystal system.
Key properties: specific gravity 7.03; Adamantine luster.
IMA symbol Irt, IMA status: approved, named in 1984.
Occurs as veinlets in altered thoreaulite, and inclusions in ixiolite and lithiotantite, in granite pegmatites.
It is found associated with Thoreaulite, ixiolite, lithiotantite.
The name refers to the Irtysh River, Kazakhstan, near which it occurs.
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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