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Figure 14
A comparison of calcite unit-cell parameter determinations for this work and derived from the ICDD database. All error bars are smaller than the sizes of the symbols except for the error in the a dimension of the brachiopod calcite. The latter has a much larger error because only four diffraction lines were observed in this case, and only two of those four have non-zero h and k Miller indices (lines 018 and 1,0,10). The unit cells have been specified using hexagonal coordinates. The sample names are as follows: limestone, refers to the pressed-powder pellet of the limestone rock sample mentioned in §4.5[link] (the EDXRD spectrum is shown in Fig. 10[link]); JDo-1 is a pressed-powder pellet of the Japanese geological standard JDo-1 (Imai et al., 1996BB60; Hansford et al., 2014BB19); Barrington is the calcite rock sample retrieved from the Barrington Chalk Pit (see §4.5[link] and Fig. 12[link]); oyster shell and brachiopod are the fossils described in §4.6[link] and shown in Fig. 13[link]; tessera and C16 mortar are archaeology samples described in §4.7[link] and shown in Fig. 16[link].

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ISSN: 2053-2733
Volume 73| Part 4| July 2017| Pages 293-311
https://doi.org/10.1107/S2053273317008592
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