NATURE AND ORIGIN OF "CALCIUM CARBONATE INCLUSIONS" Traditionally it is believed that they derive from calcareous fragments (CaCO3), and even more probable that they derive also from Dolomite (Calcium carbonate Magnesium) and, if we take as a reference the effect that is caused on the surfaces of the pieces, even chalk (calcium sulfate) falls into the egory of suspect minerals. The ...
![](/themes/3fr7/images/logo/logo.png)