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Gemmology

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Question:

If there are two shadow edges visible as pictured, one constant and one moving, but not touching, what sort of material is being tested on the refractometer?

Author: Emma Begent-Cove

If there are two shadow edges visible as pictured, one constant and one moving, but not touching, what sort of material is being tested on the refractometer?



Answer:

Anisotropic, uniaxial or biaxial


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