All I‘ve found so far is marble, and I don‘t even know if that counts - please help!
Limestone Chemical Composition
They are Chevorlet Rally Rims!!!
I think you are looking for minerals, rather than rocks. A mineral is a pure substance, a compound. It has a definite chemical composition. A rock is a mixture of two or more minerals in various compositions. To have the chemical composition as limestone, it must have a definite chemical formula, and that formula is CaCO3. Limestone itself is a rock because it is a mixture of two or more minerals, calcite and dolomite, but the principle mineral is calcite, CaCO3. The two common minerals with that chemical formula are calcite and aragonite. There is a third called vaterite, but it is less common. These three minerals all have the same chemical composition, CaCO3, but crystallize in different forms. The calcium carbonate in sea shells is the aragonite variety. Follow up Schist and gneise (sic) are forms of granite and do not usually contain calcium carbonate. Marble is a metamorphic rock which changed from limestone. Calcite has also been found in shale and sandstone. Calcite has also found in carbonatite, which is an igneous rock. Recap The bottom line is that you really need to understand the distinction between a rock (a mixture) and a mineral (a compound). Calcium carbonate, CaCO3, is a chemical compound, and it occurs in nature as three minerals: calcite, aragonite, and vaterite. Calcite, which is calcium carbonate, also occurs combined with other minerals to form mixtures which we call rocks. Calcite containing rocks include limestone and marble, as wells as shales, sandstones and the igneous rock carbonatite.
