HI @rynow, These mussels shells that growing on rock color, texture and shape looking fabulous but do you about them in details??
Europe & some foreign countries used Mussels as substitute for oysters in recipe because Mussels have Nutrition which contain
Calories 146
Protein 20g
Carbohydrate 6.3g
etc
i get that info from my sister She is Zoologist ....:)