Barrotite
Barrotite is an IMA-recognized mineral species in the silicate class, with the chemical formula Cu₉Al(HSiO₄)₂[(SO₄)(HAsO₄)₀.₅](OH)₁₂·8H₂O.
It crystallizes in the hexagonal crystal system (space group P3_1). It is a member of the Chalcophyllite structural group.
Key properties: Mohs hardness 2; specific gravity 2.9; Pale blue streak; Vitreous to subadamantine luster; optically uniaxial.
IMA symbol Bro, IMA status: approved, named in 2011.
Secondary in sandstone.
It is found associated with Chalcophyllite, malachite, cuprite, chrysocolla, algodonite.
The name refers to the Barrot Dôme, where the mines of Roua are located.
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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