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The acid in vinegar is acetic acid and the fact you have a reaction when you pour it on a rock suggests you have a carbonate rock http://www.sepmstrata.org/CMS_Images/Contributed/AppGeoStruct/tests.pdf. Common carbonates are calcite/aragonite and dolomite but there are others: https://geology.com/minerals/acid-test.shtml. The precipitate you get…[Read more]