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What kind of rock is white very light and chalky?

April 26, 2017chalky light rock white

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What kind of rock is white very light and chalky?

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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.