ULEXITE “TELEVISION STONE” and birefringent calcite

Demo Number 231
Location Shelf 41
Description When the polished bottom surface of this stone is placed upon a printed page, the words can be read on the top surface, giving the appearance of television screen. There are two pieces of birefringent calcite included.
 Related Demos
  • Ulexite (mineral specimen of hydrated sodium calcium borate) is composed of thousands of fibrous fragments that transmit light.
  • The calcite has non-cubic crystal structures that give a birefringent effect.

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This Demo is Part of the following Categories: 6A44 Total Internal Reflection, 6H35 Birefringence