Erbium
Wyckoff R W G
Crystal Structures 1 (1963) 7-83
Second edition. Interscience Publishers, New York, New York
Sample at 293 K
Hexagonal closest packed, hcp, structure
_database_code_amcsd 0011174
3.5588 3.5588 5.5874 90 90 120 P6_3/mmc
atom   x   y   z
Er   1/3 2/3 .25