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*data for   ICSD #81963
CopyRight   ?2008 by Fachinformationszentrum Karlsruhe, and the U.S. Secretary of
            Commerce on behalf of the United States.  All rights reserved.
Coll Code   81963
Rec  Date   1999/11/30
Chem Name   Magnesium Aluminium Hydroxide Carbonate Hydrate
            (0.67/0.33/2/0.17/0.5)
Structured  (Mg0.667 Al0.333) (O H)2 (C O3)0.167 (H2 O)0.5
Title       A reexamination of hydrotalcite crystal chemistry
Unit Cell   3.0460(1) 3.0460(1) 22.7720(20) 90. 90. 120.
Vol         182.98
Z           3
Space Group R -3 m H
SG Number   166
Cryst Sys   trigonal/rhombohedral
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A lattice system is described by three basis vectors. In the rhombohedral system, the crystal is described by vectors of equal length, no two of which are orthogonal. The rhombohedral system can be thought of as the cubic system stretched along a body diagonal. a = b = c; ¦Á = ¦Â = ¦Ã ¡Ù 90¡ã. In some classification schemes, the rhombohedral lattice system is combined with the hexagonal lattice system and grouped into a larger hexagonal family.
There is only one rhombohedral Bravais lattice.
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