Limestone is a sedimentary rock formed from calcareous remains of plants and animals or precipitated from solution. Limestone slabs often contains remains and fossils of sea creatures. It is natural Calcium Carbonate (CaCO3) and will yield lime when heated. Does not show much graining or crystalline structure. It has a smooth granular surface. Varies in hardness. Some dense limestones can be polished but will never be as shiny as marble or granite. Color tones are typically neutral.
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