Aleutite
A rare vanadate-arsenate found in scoria from the 2015 Tolbachik eruption in Kamchatka — effectively a natural salt inclusion.
Intro adapted from Wikipedia (CC BY-SA).
Aleutite is an IMA-recognized mineral species in the arsenate class, with the chemical formula [Cu₅O₂](AsO₄)(VO₄)·(Cu₀.₅ ₀.₅)Cl.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: specific gravity 4.887; Reddish black streak; Close to adamantine luster.
IMA symbol Aeu, IMA status: approved, named in 2018.
Forms as a sublimate at an active volcanic fumarole.
It is found associated with Anhydrite, euchlorine, kamchatkite, langbeinite, lyonsite, pseudolyonsite, tenorite, hematite.
The name refers to the Aleut ethnic group, the original inhabitants of the Commander Islands, Aleutsky District, Kamchatka Krai.