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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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Optical micrograph (crossed polarizers) of vaterite spherulites in a matrix of a large calcite crystal from an adult Lake Sturgeon otolith, Lake Winnebago, Wisconsin (standard polished thin section 30 μm thick). The onion-like rings of the spherulites are interpreted to be the daily growth rings. One spherulite in the right center is oriented such that the isogyres of a uniaxial interference figure are seen.