OP4.2 Iceland Spar (Calcite Crystal)
There is a plastic model of a calcite crystal that can be used in explain¬ing its properties. Pieces of this crystal are used in conjunction with the overhead to show birifringence. A better demonstration is to place a piece of calcite crystal is placed in a mechanism that rotates in a plane. Striking this crystal with a light source will form two dots on a screen. Rotating the crystal will move one of the dots in a circular pattern around the other.
Equipment Location: B12, B23