Rhombohedral; isomorphous with Ilmenite.
G = 4·537. H = 5. Deep blood-red; translucent; lustrous.
Pajsberg, Sweden.
Retzian.
Hydrated arsenate of Mn´´, Ca, E. Cer + Yttr = 8-11%.
Orthorhombic, usually in prisms.
G = 4·15. H = 4. Brown; pleochroic; transparent.
Province of Nordmarken, Sweden.
Rhabdophane (Scovillite).
Hydrated phosphate of E, Al, Fe, Mg, etc., with SiO₂. Cer = 53·8-57; Yttr = 2·1-10·0%.