Attakolite
Attakolite is an IMA-recognized mineral species in the silicate class, with the chemical formula CaMn²⁺Al₄(HSiO₄)(PO₄)₃(OH)₄.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 5; specific gravity 3.09–3.23; optically biaxial.
IMA symbol Ako, IMA status: approved, named in 1868.
Found in an iron deposit.
It is found associated with Berlinite, lazulite, trolleite, apatite, svanbergite, pyrophyllite, hematite, calcite, quartz.
Its name comes from the Greek for salmon, for the pale red color.
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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