TED KINSMAN / SCIENCE PHOTO LIBRARY TED KINSMAN / SCIENCE PHOTO LIBRARY
A sample of marble (having previously been converted to lime in a kiln) glows while being heated. Lime is produced by heating calcium carbonate until the extra carbon and oxygen atoms are driven off leaving just the calcium oxide, or quicklime, which is used to make limelight (a historic type of stage lighting and source of the phrase 'in the limelight'). Lime can be made from sea shells, chalk, and many types of rock, including marble.
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