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. 2019 May 9;9:7151. doi: 10.1038/s41598-019-43434-w

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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X-ray diffraction patterns (Mo Kα radiation): (a) of a lapilli otolith consisting of a single vaterite spherulite (~100 μm in diameter) from a juvenile hatchery-reared Lake Sturgeon, University of Manitoba. (b) Ideally random powdered vaterite from a Lake Sturgeon otolith, Lake Winnebago, Wisconsin. The images were recorded for 300 s while rotating the samples 1°/s around the vertical ϕ axis. The detector consists of 2 segments with a horizontal dead space between them. The shadow of the beam stop extends upward to the right. A faint shadow of the sample mounting pin extends down from center.