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More on Calcite Crystals

They are electromagnetically sensitive (react to and influenced by electromagnetic fields)

Optics studies on calcite show that it is able to refract electromagnetic radiation from a very wide range of wavelengths (well beyond visual light), and is an optic polarizer (divides a beam of light into 2 beams with opposite polarization)(http://www.sciner.com/Opticsland/Calcite.htm)

The pineal gland has photosensitive 'retinal' cells

Are calcite crystals involved in sensation for these cells and how does their geometry effect their optical properties?

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