Lapis_remy_dumont
One mineral gasteropod or land snail called helix ramondi epigenised in light blue lussatite, an opal-CT variety (cristobalite / tridymite calcedony), on peperit matrix. Although the shell was fossilized during Oligocen age, the body microcristallized about 50 000 years ago. Size: 2,2 cm. Foto & Sammlung: Rémy Dumont
 
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