Achroite and Bertrandite Optical Properties

Achroite

Bertrandite

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1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

Not Available

none.

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent, Translucent

TransparentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.614-1.6661.583-1.614

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21

1.8 Birefringence

0.014-0.040Not Available

0 0.296

1.9 Clarity

Transparent

TransparentAnthony et al

Achroite and Bertrandite Optic Character

Achroite and Bertrandite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Achroite and Bertrandite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Achroite and Bertrandite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

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Achroite and Bertrandite Transparency

Similar to their colors, Achroite and Bertrandite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Achroite is Translucent and Transparent while Achroite is Translucent and Transparent in appearance.