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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Comparative Raman spectra of calcite standard (blue line) with that of nanocrystalline phases isolated from skeletal fibers of I. basta demosponges collected near Guam (USA) (red line) and in coastal waters of Australia (green line).