Robuta

https://gemsprings.com/tridacna-shell/ Giant Clam Shell: Dense white shell of Tridacna gigas, T. squamosa and related giant clams,... Giant Clam Shell belongs to the dense white shell of Tridacna gigas, T. squamosa and related giant clams group, Aragonite CaCO3, crossed-lamellar, and sits at... giant clamtridacna gigasshelldensewhite https://www.sunbird-images.com/detail.php?picture_id=15258 Bild: Tridacna gigas tridacna gigasbild