Annerödite.
A parallel growth of Columbite on Samarskite, once believed to be a new species.
Corresponding to Columbite.
Arfvedsonite.
Metasilicate of Na, Ca, Fe´´, Zr; approximately 4Na₂O,3CaO,14FeO,(Al,Fe)₂O₃,21SiO₂. ZrO₂ = 1-6%.
Monoclinic—an amphibole.
G = 3·44. H = 6. Black; pleochroism strong.
S. Greenland and S. Norway.
Arizonite.
Ferric metatitanate, Fe₂O₃,3TiO₂ or Fe₂(TiO₃)₃. TiO₂ = 36·7%.