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Jahnsite-(CaFeFe)

Year of discovery: 1995 (Japan as the first occurence in the World)

Locality list: 4 localities of jahnsite-(CaFeFe)

• CaFe₅(PO₄)₄(OH)₂,8H₂O
• (Ca,Mn)(Fe,Mn)Fe₄(PO₄)₄(OH)₂,8H₂O
• [Ca²⁺][Fe²⁺][Fe²⁺₂][Fe³⁺₂][(OH)₂|(PO₄)₄]^14-,8H₂O
• Have not been approved by IMA.

• Class: Phosphate - Hydroxide - Hydrate

• Fe²⁺ => Mn²⁺: Jahnsite-(CaMnFe)
• Fe²⁺₃ => Mn²⁺₃: Jahnsite-(CaMnMn)

• Color: Dark brown
• Luster: Vitreous

• Hardness: 4

• System: Monoclinic
• Group: 2/m, P2/a
• Lattice: a=15.0, b=7.2, c=9.9, β=110.5