Naumannite
Wiegers G A
American Mineralogist 56 (1971) 1882-1888
The crystal structure of the low-temperature form of silver selenide
_database_code_amcsd 0000262
4.333 7.062 7.764 90 90 90 *P2_12_12_1
.25 .25 0
atom    x    y    z Biso
Ag1  .107 .369 .456  .75
Ag2  .728 .029 .361  .75
Se   .358 .235 .149  .75