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Figure 3
Unusual relationships among unit-cell parameters. (a) Non-linear relations occur between a and V. V is nearly the same for mimetite and vanadinite, but the latter has the largest a parameter. (b) The c parameter for mimetite is larger than that for vanadinite, which is nearly the same as that for pyromorphite. (c) Pyromorphite has the largest c/a parameter. (d) Pyromorphite and vanadinite have a similar c parameter, but that for mimetite is the largest. Our data for the pyromorphite sample from China have the smallest V, which is different from other studies for samples from this locality. Unit-cell data shown as yellow triangles are from the literature (Dai & Hughes, 1989BB14; Calos et al., 1990BB11; Dai et al., 1991BB15; Hashimoto & Matsumoto, 1998BB21; Laufek et al., 2006BB29; Sejkora et al., 2011BB42; Mills et al., 2012BB33).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 1| January 2018| Pages 214-221
https://doi.org/10.1107/S1600577517014217
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