GeTh
Brown, A.Norreys, J.J.
Journal of the Less-Common Metals (1963) 5, 302-313
a=6.046Å b=6.046Å c=6.046Å
α=90° β=90° γ=90°
Si2U
Nature (London) (1959) 183, 673-673
a=4.028Å b=4.028Å c=3.852Å
α=90° β=90° γ=120°