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Figure 7
Pattern matching using an Opal-CT sample in the ICDD clays database as a reference. This figure needs to be examined in conjunction with Table 2[link]. The top two matches (excluding the reference opal) are opal CT and opal-A; the latter has a very different peak profile compared with the remaining samples. There are also problems with peak offsets.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 37| Part 2| March 2004| Pages 231-242
doi:10.1107/S002188980400038X
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