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THE MINERAL ULEXITE

Ulexite sometimes known as TV rock, is a mineral occurring in silky white rounded crystalline masses or in parallel fibers. The natural fibers of ulexite conduct light along their long axes, by internal reflection.

Ulexite is also known as TV rock due to its unusual optical characteristics. The fibers of ulexite act as optical fibers, transmitting light along their lengths by internal reflection. When a piece of ulexite is cut with flat polished faces perpendicular to the orientation of the fibers, a good-quality specimen will display an image of whatever surface is adjacent to its other side.
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Ulexite TV Rock 1 Inch
Sale Price: $4.99

This is Ulexite also known as TV Rock for its unique optical properties. If you place the stone on top of written text it is reflected in the top of the stone, like a TV. You will receive a specimen that is 1 inch to 1 1/2 inch long and 1 inch to 1 1/4 inch wide. These are all 1/2 inch thick which is the optimal thickness for revealing the unique optical properties.