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#calcium carbonate
#eggshell
#seashell
#coral
#biomineralization
#calcium source
#natural CaCO3
#oyster shell
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#types of shells
#snail shell
#oyster shell
#mollusk shells
#conch
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#mother of pearl
#nacre
#oyster shell
#iridescent shell
#rainbow shell
#shell lining
#mop
#calcium carbonate #eggshell #seashell #coral #biomineralization #calcium source #natural CaCO3 #oyster shell