Edtollite
Edtollite is an IMA-recognized mineral species in the arsenate class, with the chemical formula K₂NaCu₅Fe³⁺O₂(AsO₄)₄.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Edtollite structural group.
Key properties: specific gravity 4.264; Light brown streak; Semi-metallic luster.
IMA symbol Edt, IMA status: approved, named in 2016.
A sublimate on basaltic scoria at an active volcanic fumarole.
It is found associated with Hematite, dmisokolovite, johillerite, bradaczekite, orthoclase, sylvite.
The mineral was named to honor Russian geologist and Arctic explorer Eduard Vasilievich Toll (1858-1902) for contributions to the geology and geography of Polar Siberia and islands in the Arctic Ocean.
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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