Originally Posted by oceangrl11
ok then so silica is ok to have in the oyster shells? All it is is sand?
Well, not quite. Sand is made of silica, glass is made of sand (sort of) and....you get the point.
The oyster shells just are made up of the same mineral that sand is. Silica is one of the more abundant minerals on the planet and one of the most abundant in the ocean so it makes sense that many creatures use it.