Taranakite
Chemical compound
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Taranakite is a hydrated alkali iron-aluminium phosphate mineral with chemical formula (K, Na)₃(Al, Fe³⁺)₅(PO₄)₂(HPO₄)₆·18 H₂O. It forms from the reaction of clay minerals or aluminous rocks with solutions enriched in phosphate derived from bat or... Wikipedia
Formula mass: 1,342.30 g/mol
Crystal class: Hexagonal scalenohedral (3m); H-M symbol: (3 2/m)
Crystal habit: Platy, massive, nodular
Crystal system: Trigonal
Solubility: Insoluble in water; Slightly soluble in acids
Strunz classification: 8.CH.25
Unit cell: a = 8.7025, c = 95.05; Z = 6