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I've made few simple tests and I'm pretty sure that it is chalk - it vigorously dissolves in acetic acid without residue, and after dehydration it looks exactly like chalk.
You can judge by yourself - on the picture attached - left is natural chalk and right is dehydrated Coral Snow, the stone is chalk.
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Since chalk is almost pure calcite - Calcium carbonate with traces of Magnesium carbonate, silicates, ferric oxides,inorganic phosphates etc, I decide to give a try to pure calcium carbonate (analytical grade) instead Coral Snow - and it works like charm - it has the same effect, and I'm sure that there is no unwanted impurities like phosphates, silicates and ferric salts.