Ar
Dobbs, E.R.Figgins, B.F.Jones, G.O.Piercey, D.C.Riley, D.P.
Nature (London) (1956) 178, 483-483
a=5.4Å b=5.4Å c=5.4Å
α=90° β=90° γ=90°
C
Riley, D. P.
Nature (1944) 153, 587-588
a=3.56679Å b=3.56679Å c=3.56679Å