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limestone or could be gypsum Could be chalk. Dip it in vinegar. If it fizzes, it might be a sedimentary carbonate rock like limestone or chalk. There is always a possibility it is another kind of sedimentary rock or possibly an extrusive igneous one. Testing is needed to be sure.

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16y ago
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15y ago

Blackboard chalk is a rock or mineral consisting of Calcium Sulfate (CaSO4). Calcium Carbonate (CaCO3) is also called chalk.

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13y ago

No. Chalk is a form of limestone, a sedimentary rock.

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13y ago

True.

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Q: Is chalk a type of igneous rock?
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