Peprossiite-(Ce)
Callegari A, Caucia F, Mazzi F, Oberti R, Ottolini L, Ungaretti L
American Mineralogist 85 (2000) 586-593
The crystal structure of peprossiite-(Ce), and anhydrous REE and Al mica-like borate
with square-pyramidal coordination for Al
Sample: Pep1
_database_code_amcsd 0002424
4.612 4.612 9.374 90 90 120 P-62m
atom     x      y     z  occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
PrM2     0      0     0 .818  .0122  .0122  .0083  .0061      0      0
CaM2     0      0     0 .102  .0122  .0122  .0083  .0061      0      0
AlM1 .3889      0    .5  2/3  .0046  .0048  .0060  .0024      0      0
BT     1/3    2/3 .2202 .967  .0078  .0078  .0059  .0039      0      0
SiT    1/3    2/3 .2202 .033  .0078  .0078  .0059  .0039      0      0
O1     1/3    2/3 .3754       .0092  .0092  .0054  .0046      0      0
O2   .4215      0 .1612       .0131  .0072  .0087  .0036 -.0030      0
O3       0      0    .5  2/3  .0046  .0046  .0086  .0023      0      0