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Arrojadite-(KFe)

Year of discovery: before 1959 (Serra Branca pegmatite, Brazil, and Nickel Plate mine, USA), 1977 (Japan)

Locality list: A locality of Arrojadite-(KFe)

• KNa₃CaFe²⁺₁₄Al(PO₄)₁₁(HPO₄)(OH)₂
• KNa₃Ca(Fe²⁺,Mn²⁺,Mg)₁₄Al(PO₄)₁₁(HPO₄)(OH,F)₂
• [K⁺Na⁺][Fe²⁺][Ca²⁺][Na⁺₂][][Fe²⁺₁₃][Al³⁺][(OH)₂|HPO₄|(PO₄)₁₁]^37-

• Class: Arrojadite group
• Class: Phosphate - Hydroxide
• Radioactive: Very weak

• K => Na: Arrojadite-(NaFe)

• KNa => Ba: Arrojadite-(BaFe)
• KNa => Pb: Arrojadite-(PbFe)
• KNa => Sr: Arrojadite-(SrFe)

• Fe => Na₂: Arrojadite-(KNa)

• Fe => Mn: Dickinsonite-(KMnNa) (Series)

• Color: Grayish green
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: Good on {100} (1 plane), Distinct on {010} (1 plane)
• Hardness: 5
• Density: 3.5

• System: Monoclinic
• Group: m, Cc
• Lattice: a=16.5, b=10.1, c=24.8, β=105.7