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

This work has been released into the public domain by its author, Arpingstone at English Wikipedia . This applies worldwide. In some countries this may not be legally possible; if so: Arpingstone grants anyone the right to use this work for any purpose , without any conditions, unless such conditions are required by law. Public domain Public domain false false

The picture shows the double refraction of the light by the calcite.

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