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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

Public domain This image has been (or is hereby) 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.

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

The following pages on the English Wikipedia link to this file (pages on other projects are not listed):
  • Refractive index
  • Calcite
  • Birefringence
  • Against the Day
  • Photon polarization