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Ferriandrosite-(La)

Year of discovery: 2015 (Japan as the first occurence in the World)

Locality list: A locality of ferriandrosite-(La)

• MnLaFeAlMnSi₃O₁₂(OH)
• [Mn²⁺La³⁺][Fe³⁺Al³⁺Mn²⁺][OH|O|SiO₄|Si₂O₇]^13-

• Class: Allanite group < Epidote supergroup
• Class: Sorosilicate - Nesosilicate - Oxide - Hydroxide

• Mn => Ca: Ferriakasakaite-(La)

• La => Ce: Ferriandrosite-(Ce)

• Fe => Mn: Manganiandrosite-(La)

• Color: Black
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Imperfect on {001} (1 plane)

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=8.9, b=5.7, c=10.1, β=113.9