Canosioite
Canosioite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ba₂Fe³⁺(AsO₄)₂(OH).
It crystallizes in the monoclinic crystal system (space group P2_1/m). It is a member of the Brackebuschite structural group.
Key properties: Mohs hardness 6–6.5; specific gravity 4.943; Pale yellow streak; Vitreous luster; optically biaxial.
IMA symbol Cso, IMA status: approved, named in 2015.
From the dumps of a vein-controlled, polymetallic hydrothermal deposit.
It is found associated with Aegirine, barite, calcite, hematite, Mn-bearing muscovite, unidentified Mn oxides, unidentified Mn arsenates.
The name refers to the small municipality of Canosio, of ∼80 inhabitants, near the Valletta 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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