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Allanite-(Ce) (Photo)

Year of discovery: 1810 (Qáqarssuatsiaq, Greenland), 1896 (Japan)

Locality list: 494 localities of allanite-(Ce)

• CaCeAl₂FeSi₃O₁₂(OH)
• (Ca,Mn)(Ce,Y,La)Al₂FeSi₃O₁₂(OH)
• [Ca²⁺Ce³⁺][Al³⁺₂Fe²⁺][OH|O|SiO₄|Si₂O₇]^13-

• Class: Allanite series < Allanite group < Epidote supergroup
• Class: Sorosilicate - Nesosilicate - Oxide - Hydroxide
• Soluble in: HCl (Gel residue)
• Radioactive: Weak

• Ce => Y: Allanite-(Y)
• Ce => Nd: Allanite-(Nd)
• Ce => La: Allanite-(La)
• Ce => Ca: Epidote
• Ce => Pb: Epidote-(Pb)
• Ce => Sr: Epidote-(Sr)

• Ca => Mn: Uedaite-(Ce)

• Al => Fe³⁺: Ferriallanite-(Ce)

• Color: Black-Brown
• Streak: Brown-Gray
• Luster: Vitreous
• Diaphaneity: Translucent, Opaque

• Habit: Prismatic
• Striation: Parallel to elongation

• Cleavage: Imperfect on {001} (1 plane), Indistinct on {100} and {110} (2 planes)
• Hardness: 5.5
• Density: 3.8

• System: Monoclinic
• Group: 2/m, P2₁/m, Z=2
• Lattice: a=8.9, b=5.8, c=10.1, β=114.8 (2005)