Anatase (Octahedrite).
Titanium dioxide. TiO₂ = 97-100%.
Tetragonal; habit octahedral.
G = 3·82-3·95. H = 51⁄2-6. Transparent to opaque; brown to black.
Dauphiné; Bavaria; Cornwall; Norway; Brazil, etc.
Ancylite.
4Ce(OH)CO₃ + 3SrCO₃ + 3H₂O; with Fe, Mn, Ca, F, traces. Cer = 46·3%.
Rhombic; prismatic.
G = 3·95. H = 41⁄2. Brown; translucent.
Plain of Narsarsuk, Greenland.