Pure, dry natural marble is an exceptional electrical insulator because its primary mineral constituent, calcium carbonate, possesses tightly bound ionic structures that do not permit free electron flow. However, if marble contains conductive metallic impurities—such as iron pyrites or copper veins—or if the stone is wet and absorbs moisture through its pores, its electrical resistance drops significantly. Overall, solid dry marble is routinely utilized as an insulating slab in specialized electrical and laboratory applications.
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