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Chevkinite-(Ce)

Year of discovery: 1839 (Ilmen natural reserve, Russia), 1950 (Japan)

Locality list: 3 localities of chevkinite-(Ce)

• Ce₄(Ti,Fe²⁺,Fe³⁺)₅Si₄O₂₂
• (Ce,La,Ca,Th)₄(Fe²⁺,Mg)(Fe²⁺,Ti,Fe³⁺)₂(Ti,Fe³⁺)₂Si₄O₂₂
• [Ce³⁺₄][Fe²⁺][Fe³⁺₂][Ti⁴⁺₂][O₈|(Si₂O₇)₂]^28-

• Class: Chevkinite group
• Class: Sorosilicate - Oxide
• Soluble in: HCl (Gel residue)
• Radioactive: Weak
• Substitution pseudomorph: Replaced by Bastnäsite-(Ce) (Bastnasite-(Ce)).

• Polymorph: Dingdaohengite-(Ce) (Monoclinic), Perrierite-(Ce) (Monoclinic)

• Ce => La: Perrierite-(La)

• Color: Black
• Streak: Black
• Luster: Resinous
• Diaphaneity: Translucent-Opaque

• Cleavage: No
• Hardness: 5-5.5
• Density: 4.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=13.6, b=5.8, c=11.2, β=100.8