Stoppaniite Ferraris G, Prencipe M, Rossi P European Journal of Mineralogy 10 (1998) 491-496 Stoppaniite, a new member of the beryl group: crystal structure and crystal-chemical implications _database_code_amcsd 0006751 9.397 9.397 9.202 90 90 120 P6/mcc atom x y z occ Uiso FeM 1/3 2/3 1/4 .61 .013 AlM 1/3 2/3 1/4 .21 .013 MgM 1/3 2/3 1/4 .18 .013 BeT' 1/2 0 1/4 2/3 .013 SiT' 1/2 0 1/4 1/3 .013 BeT" .3799 .1069 0 1/6 .012 SiT" .3799 .1069 0 5/6 .012 NaA' 0 0 0 .55 .038 WatA" 0 0 1/4 .057 O1 .3005 .2256 0 .018 O2 .4890 .1353 .1470 .022