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A basic silicate of Cerium metals, with Ca and Fe. Approximately H₃(Ca,Fe)Ce₃Si₃O₁₃. Cer = 50·7-71·8%. In a variety from Batoum, Tschermak reports Yttr = 7·6 and ZrO₂ = 11·7%.

Orthorhombic; usually massive or granular.

G = 4·9. H = 5-6. Brown to red; translucent to opaque.

Ryddarhyttan, Sweden; Batoum, Caucasus?