Keywords: Calcite.jpg 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 Arpingstone The picture shows the double refraction of the light by the calcite tone Birefringence Iceland spar |