Portlandite
Wyckoff R W G
Crystal Structures 1 (1963) 239-444
Second edition. Interscience Publishers, New York, New York
Note: cadmium iodide structure
_database_code_amcsd 0011777
3.5844 3.5844 4.8962 90 90 120 P-3m1
atom   x   y     z
Ca     0   0     0
OH   1/3 2/3 .2330