Thomas Cagniard (1), Jean-Pierre Gauthier (2) & Jacques Fereire (2) Abstract Highlighted by popular belief, the eye of Saint-Lucia is a biomineral, which is of undoubted gemological interest by its nature and through its use. As gastropod operculum of the species Bolma rugosa, its name is not protected and may have been used for other […]
Jean-Pierre Gauthier (1), Jacques Fereire (1) & Thanh Nhan Bui (2) Abstract The flame structure of the red helmet shell, Cypraecassis rufa (Linnaeus, 1758) Among molluscs with so-called “porcelaneous” shells, consisting of non-nacreous aragonite, we chose a gastropod, Cypraecassis rufa, to show an example of flame structure on cabochon-cut samples. The crossed structure of this […]
