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Turquoise
Turquoise

Bertrandite
Bertrandite



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Bertrandite

Turquoise and Bertrandite Optical Properties

1 Optical Properties
1.1 Luster
Waxy
Vitreous
1.2 Pleochroism
Weak
none.
1.3 Dispersion
Albite Optical ..
None
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Fluorite Optical Properties
1.4 Transparency
Translucent, Opaque
TransparentAnthony et al, Handbook of mineralogy (2001)
1.5 Refractive Index
1.610-1.650
1.583-1.614
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Triclinic
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
1.8 Birefringence
0.040
Not Available
1.9 Clarity
Translucent
TransparentAnthony et al

Turquoise and Bertrandite Optic Character

Turquoise and Bertrandite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Turquoise 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 Turquoise 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.

Turquoise and Bertrandite Transparency

Similar to their colors, Turquoise 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, Turquoise is Opaque and Translucent while Turquoise is Opaque and Translucent in appearance.