|  | This is a file from the  Wikimedia Commons. Information from its  description page there is shown below.Commons is a freely licensed media file repository.  You can help.
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        Calcite. From wp-en. Banded agate. The specimen is one inch (2.5 cm) wide. Picture made without a camera by laying the carving on a flat bed scanner. Released to the public domain by Adrian Pingstone in May 2003. by  en:User:Arpingstone
        
         
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          |  | This work has been released into the  public domain by its author,  Arpingstone at the  English Wikipedia project. This applies worldwide. 
 In case this is not legally possible:Arpingstone grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
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        The picture shows the double refraction of the light by the calcite.
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