a marble

Science Dictionary
marble   (mär'bəl)  Pronunciation Key 
A metamorphic rock consisting primarily of calcite and dolomite. Marble is formed by the metamorphism of limestone. Although it is usually white to gray in color, it often has irregularly colored marks due to the presence of impurities such as silica and clay. Marble is used especially in sculpture and as a building material.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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