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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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TitleCrystal-chemical study of cation disordering in Al-rich and Al-poor orthopyroxenes from spinel iherzolite xenoliths.
AuthorsMolin, G.M.
ReferenceIC&volume=74&fpage=593&details=yes target=icsd_help>American Mineralogist (1989) 74, 593-598
Link XRef SCOPUS Google
CompoundFe0.21 Mg1.79 O6 Si2 - [Enstatite, ferroan] Magnesium iron catena-disilicate (1.8/0.2/1) [ABX3] [oP80] [c10] []
Cell18.2440(10), 8.805(1), 5.196(1), 90., 90., 90.
PBCA (61) V=834.68
RemarksR=0.025000 : M =Enstatite, ferroan : P =19-768 :
PDF 19-768, mean T-O: 1.628, 1.647, M-O: 2.069, 2.161
Sample Le4A, heated to 1323 K for 90 min

Atom (site) Oxid. x, y, z, B, Occupancy
Mg1(8c)2
Fe1(8c)2
Mg2(8c)2
Fe2(8c)2
Si1(8c)4
Si2(8c)4
O1(8c)-2
O2(8c)-2
O3(8c)-2
O4(8c)-2
O5(8c)-2
O6(8c)-2
0.370.650.8600.94
0.370.650.8600.05
0.370.480.3500.84
0.370.480.3500.15
0.270.340.0401
0.470.330.8001
0.180.330.0301
0.310.500.0401
0.300.220.8201
0.560.330.8001
0.430.480.6901
0.440.190.6001
Atom (site) Oxid. U11, U22, U33, U12, U13, U23
Mg1(8c)2
Fe1(8c)2
Mg2(8c)2
Fe2(8c)2
Si1(8c)4
Si2(8c)4
O1(8c)-2
O2(8c)-2
O3(8c)-2
O4(8c)-2
O5(8c)-2
O6(8c)-2
0.000.000.000.00-.000.00
0.000.000.000.00-.000.00
0.010.010.01-.00-.00-.00
0.010.010.01-.00-.00-.00
0.000.000.00-.000.00-.00
0.000.000.000.00-.000.00
0.000.000.01-.00-.00-.00
0.010.000.01-.00-.00-.00
0.010.010.010.000.00-.00
0.000.010.01-.000.000.00
0.010.010.010.000.000.00
0.000.010.010.00-.00-.00

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