Matlockite
Wyckoff R W G
Crystal Structures 1 (1963) 294-296
Second edition. Interscience Publishers, New York, New York
Note: tetragonal PbFCl structure
_database_code_amcsd 0011855
4.106 4.106 7.23 90 90 90 P4/nmm
atom x  y   z
Pb   0 .5 .20
F    0  0   0
Cl   0 .5 .65