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
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
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