Mn K-edge XANES spectra of KMnO4, MnO2 and MnCO3 standards and Discorhabdus striatus, Watznaueria britannica (four spectra from four different spots within the same coccolith), Discoaster falcatus and Helicosphaera carteri coccoliths. Those data were acquired through the project ES113 at ESRF. D. striatus and W. britannica are from Murtinheira section at Cabo Mondego, Portugal. Discoaster falcatus is from Wilson lake core, NJ, USA. Helicosphaera carteri is from MD05-2920 core section.
UPDATE 2020-05-15: Species name = Discoaster araneus to Discoaster falcatus