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Hydrated fluocarbonate of Cerium metals, E(F)CO₃. Cer = 64-93·5; ThO₂ = 0-10%.

Hexagonal prisms, pseudomorphous after Tysonite (q.v.); or massive.

G = 4·9-5·2. H = 4-4¹⁄₂. Yellow to brown; transparent.

Bastnäs, Sweden; Pike’s Peak, Colorado.