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Light polorisation
Polariscope

Polariscope: Principle

Polariscope: how to use it

Polariscope:help to  discriminate betwen singly and doubly refractive gems, determinate optic character uni of bi axial and pleochroism

Polariscope: singly refractive and agregate gems

Polariscope: how to use it. Place the stone between 2 cross polarised filter.

Polariscope: double refractive and strain anisotropy

If it's all black it's a singly refractive gem, ift it's all white you have an agregate gem

Polariscope: isotropic examples

Polariscope: anisotropic examples

Polariscope: double refractive visible every 90° and strain anisotropy if irregular exctinction
Polariscope: isotropic examples always black garnets, spinels, natural glass, fluorite, diamonds, opals and plastics

Polariscope: strain anistropy

Examples Beryl, chrysoberyl, corundum, feldspar, Peridot, Quartz, topaz, tourmaline, diopside, tanzanite, kunsite, and zircon
Strain anistropy, examples: almandine garnet, amber, some diamonds, Verneuil sapphires, some plastic gems and some opals

Polariscope: isotropic exemples

Polariscope: isotropic exemples, almandine garnet and Pyrope garnet.

Polariscope: anisotropic exemples

Polariscope: anisotropic exemples: quartzz, treated green Chalcedony and blue hemimorphite

For more information: visit www.gemologyproject.com

and the video here:

Chelsea Conoscope Magnet Polariscope Dichroscope  UV
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