Marble is a metamorphic rock, formed by the alteration of limestone under high temperature and/or high pressure. Marbles formed from pure calcite limestones are white, with a sugary texture, and they effervesce when tested with dilute (~10%) hydrochloric acid. Impurities in the limestone may lead to the formation of new minerals, giving the marble a variety of colours. Stonemasons often give the name marble to any rock that takes a good polish, but this is incorrect in geological terminology.
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