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Figure 6
(a) A comparison of quartz unit-cell parameter determinations for this work (for samples where at least nine quartz peaks were identified – eight separate determinations) and derived from the ICDD database. Star-quality (the highest quality mark) ICDD data points are shown in red. The error bars are as reported by the fitting routine, but for five of the data points are not shown because they are smaller than the size of the symbols. (b) A comparison of unit-cell parameter determinations for a range of Ca-, Mg-, Fe-, Mn-containing carbonates (all belonging to the trigonal crystal system) for this work and derived from the ICDD database. The unit cells have been specified using hexagonal coordinates. This figure shows unit-cell dimensions for eight calcites, three dolomites [CaMg(CO3)2], one siderite and one magnesite as determined in this study. Rhodochrosite has the formula MnCO3.

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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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