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Ferriallanite-(La)

Year of discovery: 2011 (In den Dellen quarries, Germany)

Locality list:

• CaLaAlFe₂Si₃O₁₂(OH)
• Ca(La,Ce)AlFe₂Si₃O₁₂(OH)
• [Ca²⁺La³⁺][Fe³⁺Al³⁺Fe²⁺][OH|O|SiO₄|Si₂O₇]^13-

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

• La => Ce: Ferriallanite-(Ce)

• Fe³⁺ => Al: Allanite-(La)

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

• Cleavage: No
• Hardness: 6
• Density: 4.2

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=8.9, b=5.8, c=10.2, β=114.5