Melanarsite
Melanarsite is an IMA-recognized mineral species in the arsenate class, with the chemical formula K₃Cu₇Fe³⁺O₄(AsO₄)₄.
It crystallizes in the monoclinic crystal system (space group C2/c).
Key properties: Mohs hardness 4; specific gravity 4.386; Dark green with an olive hue streak; Vitreous luster; optically biaxial.
IMA symbol Mea, IMA status: approved, named in 2014.
Occurs as sublimates on scoria around an active fumarole.
It is found associated with Dmisokolovite, shchurovskite, bradaczekite, hematite, As-bearing orthoclase, johillerite, arsmirandite, aphthitalite, tenorite, langbeinite, anhydrite.
A prefix from the Greek μέλαν (black) for the mineral color and its identity as an arsenate.
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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