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Figure 1
(a) In situ outcrop of the bedded carbonate-chert `zebra rock' in the Dresser Formation (Locality: UTM Zone 50 K E753868, N7665540). This view, perpendicular to bedding, shows the alternating carbonate (brown)–chert (white) bedding and the presence of radiating crystal splays (circle). (b) Detail of crystal pseudomorphs in a hand sample, looking at a plane close to bedding. Hollow casts of hexagonal or pseudohexagonal pseudomorphic crystals forming radial crystal aggregates are clearly visible (white arrow). (c) Thin section of the sample (transmitted light microscopy), showing the hollow crystal splays and the lamination.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 51| Part 4| August 2018| Pages 1050-1058
https://doi.org/10.1107/S1600576718007343
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