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CODE:
*data for ICSD #82874
Coll Code 82874
Rec Date 1998/06/26
Mod Date 2008/02/01
Chem Name Dialuminium Tetramagnesium Dodecahydroxide Carbonate Trihydrate
Structured Al2 Mg4 (O H)12 (C O3) (H2 O)3
Sum C1 H18 Al2 Mg4 O18
ANX AB2C4X18
Min Name Quintinite 2H
D(calc) 2.13
Title Crystal structure and comparative crystal chemistry of Al2 Mg4 (O
H)12 (C O3). 3(H2 O), a new mineral from the hydrotalcite- manasseite
group
Author(s) Arakcheeva, A.V.;Pushcharovskii, D.Yu.;Rastsvetaeva, R.K.;Atencio,
D.;Lubman, G.U.
Reference Kristallografiya
(1996), 41(6), 1024-1034
American Mineralogist
(1967), 52, 1036-1047
Unit Cell 5.283(3) 5.283(3) 15.150(9) 90. 90. 120.
Vol 366.19
Z 1
Space Group P -6 2 m
SG Number 189
Cryst Sys hexagonal
Pearson hP43
Wyckoff i2 h g f e2
R Value .039
Red Cell P 5.283 5.283 15.15 90 90 120 366.188
Trans Red 1.000 0.000 0.000 / 0.000 1.000 0.000 / 0.000 0.000 1.000
Comments R(isotropic)=0.047; 2nd ref. (Ross & Kodama)
Compound with mineral name: Quintinite 2H
The structure has been assigned a PDF number (experimental
powder diffraction data): 51-1528
X-ray diffraction from single crystal
Position of 6 Elements of H Are Undetermined.
Atom # OX SITE x y z SOF H ITF(B)
Mg 1 +2 4 h 0.3333 0.6667 0.243(3) 1. 0 1.8(1)
Al 1 +3 2 e 0 0 0.259(3) 1. 0 2.6(1)
C 1 +4 2 e 0 0 0.021(8) 0.5 0 6.3(9)
O 1 -2 6 i 0 0.651(2) 0.325(8) 1. H1 2.9(2)
O 2 -2 6 i 0.318(2) 0 0.190(1) 1. H1 2.7(2)
O 3 -2 3 f 0.244(3) 0 0 1. 0 4.3(6)
O 4 -2 3 g 0.598(5) 0 0.5 1. H2 6.5(8)
H 1 +1 6 i 0.35(3) 0.35(3) 0.398(9) 1. 0 3.0(8)
H 2 +1 6 i 0 0.36(3) 0.125(9) 1. 0 3.0(8)
*end for ICSD #82874
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