Which of the following is considered a harmful mineral?

Lead is considered a harmful mineral due to its toxic effects on human health, even at low levels of exposure. It is a heavy metal that can cause a range of serious health issues, including neurological damage, especially in children, and cardiovascular problems in adults. Lead exposure can result from various sources such as contaminated water, old paint, and certain industrial processes. Unlike essential minerals like calcium and iron, which are necessary for various bodily functions, lead has no beneficial role in human physiology and poses significant risks to health when ingested or inhaled. Therefore, recognizing lead as harmful is crucial in promoting public health and safety.