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CC=Collection Code: [AB2X4]=ANX Form: [cF56]=Pearson: [e d a]=Wyckoff Symbol: [Al2MgO4]=Structure Type:
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CC=74011 Help
TitleThe crystal structure of preiswerkite.
AuthorsOberti, R.;Ungaretti, L.;Tlili, A.;Smith, D.C.;Robert, J.-L.
ReferenceIC&volume=78&fpage=129&details=yes target=icsd_help>American Mineralogist (1993) 78, 129-129
Link XRef SCOPUS Google
CompoundH2 Al3.15 Mg1.85 Na0.85 O12 Si2 - [Preiswerkite 1M] Sodium magnesium aluminium phyllo-dialumodisilicate hydroxide (0.9/1.9/1.2/1/2) [ABC6X12] [mS44] [j3 i2 h d a] []
Cell5.228(7), 9.049(10), 9.819(12), 90., 100.41(13), 90.
C12/M1 (12) V=456.87
RemarksR=0.046000 : M =Preiswerkite 1M : =42-605 : D
Calculated density unusual but tolerable.
PDF 42-605, sample KP17, mean M-O: 2.060, 2.007

Atom (site) Oxid. x, y, z, B, Occupancy
O1(8j)-2
O2(4i)-2
O3(8j)-2
O4(4i)-2
Si1(8j)4
Al1(8j)3
Mg1(2d)2
Al2(2d)3
Mg2(4h)2
Al3(4h)3
Na1(2a)1
H1(4i)1
0.850.190.1501
0.4500.1601
0.630.170.3901
0.1200.3901.
0.570.160.2100.5
0.570.160.2100.5
00.50.500.85
00.50.500.15
00.830.500.5
00.830.500.5
00000.85
0.0800.291.1
Atom (site) Oxid. Beta11, Beta22, Beta33, Beta12, Beta13, Beta23
O1(8j)-2
O2(4i)-2
O3(8j)-2
O4(4i)-2
Si1(8j)4
Al1(8j)3
Mg1(2d)2
Al2(2d)3
Mg2(4h)2
Al3(4h)3
Na1(2a)1
H1(4i)1
0.000.000.000.000.00-.00
0.010.000.0000.000
0.000.000.00-.00-.000.00
0.000.000.000-.000
0.000.000.00-.000.00-.00
0.000.000.00-.000.00-.00
0.000.000.0000.000
0.000.000.0000.000
0.000.000.0000.000
0.000.000.0000.000
0.010.000.0000.000
000000

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