Gatewayite
Gatewayite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca₆(As³⁺V⁴⁺₃V⁵⁺₉As⁵⁺₆O₅₁)·31H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1).
Key properties: Mohs hardness 2; specific gravity 2.34; Grayish blue streak; Vitreous luster; optically biaxial.
IMA symbol Gwy, IMA status: approved, named in 2014.
Forms secondarily through oxidation of montroseite-corvusite assemblages in a moist environment.
It is found associated with Morrisonite, packratite, vanarsite, pharmacolite, montroseite, corvusite.
The name refers to the Gateway mining district in which the Packrat mine is located. Gateway is also the nearest town to the Packrat mine.
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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