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Bertrandite
Bertrandite

Tourmaline
Tourmaline



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Bertrandite
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Tourmaline

Bertrandite and Tourmaline Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous
1.2 Pleochroism
none.
typically moderate to strong
1.3 Dispersion
NA0.02
Fluorite Optical Properties
0.007 1
1.4 Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)
Transparent, Translucent, Transparent to opaque
1.5 Refractive Index
1.583-1.6141.614-1.666
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
Trigonal
1.8 Birefringence
Not Available0.014-0.040
Achroite
0 0.296
1.9 Clarity
TransparentAnthony et al
Transparent

Bertrandite and Tourmaline Optic Character

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

Bertrandite and Tourmaline Transparency

Similar to their colors, Bertrandite and Tourmaline 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, Bertrandite is Handbook of mineralogy (2001) and TransparentAnthony et al while Bertrandite is Handbook of mineralogy (2001) and TransparentAnthony et al in appearance.