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Natrodufrénite, Natrodufrenite

Year of discovery: 1981 (Pluherlin castle, France), 2021 (Japan)

Locality list: A locality of natrodufrénite

• NaFe₆(PO₄)₄(OH)₆,2H₂O
• [Na⁺][Fe²⁺][Fe³⁺₅][(OH)₆|(PO₄)₄]^18-,2H₂O

• Class: Phosphate - Hydroxide - Hydrate

• Na => Ca_0.5: Dufrénite

• Fe²⁺ => Mn²⁺: Gayite

• Fe³⁺ => Al: Burangaite

• Color: Dark green

• Hardness: 3.5-4.5

• System: Monoclinic
• Group: 2/m, C2/c
• Lattice: a=25.8, b=5.2, c=13.8, β=111.5