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Bertrandite
Bertrandite

Augelite
Augelite



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Bertrandite
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Augelite

Bertrandite and Augelite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Pearly
1.4 Pleochroism
none.
NilArthur Thomas
1.6 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.7 Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)
Gemmological Tables (2004) More from other references
1.8 Refractive Index
1.583-1.6141.570-1.591
Agate Opal
1 3.25
1.10 Optic Character
Not Available
Not Available
1.14 Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
1.15 Birefringence
Not Available0.020-0.021
Achroite
0 0.296
1.16 Clarity
TransparentAnthony et al
TransparentUlrich Henn and Claudio C. Milisenda

Bertrandite and Augelite Optic Character

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

Similar to their colors, Bertrandite and Augelite 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.