Gemmology: 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?

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?

Emma Begent-Cove · Accepted Answer

Anisotropic, uniaxial or biaxial

Gemmology

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?

Anisotropic, uniaxial or biaxial

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