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. 2022 Feb 9;478(2258):20210601. doi: 10.1098/rspa.2021.0601

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© 2022 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 5. — The XRPD patterns for the powder obtained from the crystallization of calcium carbonate at different durations (shown in the legend) at 8 mg ml⁻¹ of calcium chloride in the presence of 1.5 mM of: (a) Ba²⁺, (b) Fe³⁺, (c) Li⁺. Blue circles indicate the characteristic peaks of vaterite, green triangles the characteristic peaks of aragonite and red squares the characteristic peaks of calcite. (Online version in colour.)