why marble and chock have same formula but chock easily broken but marble not
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Due to it's structure .
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The formula for Limestone, Marble and Chalk is same ,i.e., CaCO3 All of them are a form of calcium carbonate.
Chemically there is no difference in them but they differ in their physical structure.
Marble has a hard crystalline structure while Chalk is amorphous in nature. But limestone is a sedimentary rock which can occur in both crystalline and amorphous form.
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