title: [Polycristalline calcite in sea urchins (Echinodermata, Echinoidea)].
mesh_terms: D000818:Animals; D002113:Calcification, Physiologic; D002119:Calcium Carbonate / Q000032:analysis*; D003460:Crystallization; D004447:Echinodermata / Q000032:analysis*; D006245:Hardness Tests; D008274:Magnesium / Q000032:analysis; D008855:Microscopy, Electron, Scanning; D014074:Tooth Calcification
chemical_list: D002119:Calcium Carbonate; D008274:Magnesium
vernacular_title: Polykristalliner Calcit bei Seeigeln (Echinodermata, Echinoidea.