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Bertrandite
Bertrandite

Apophyllite
Apophyllite



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Bertrandite
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Apophyllite

Bertrandite and Apophyllite Optical Properties

1 Optical Properties
1.1 Luster
Vitreous
Vitreous, Pearly
1.2 Pleochroism
none.
Dichroic (colorless)
1.3 Dispersion
NANA
Fluorite Optical Properties
0.007 1
1.4 Transparency
TransparentAnthony et al, Handbook of mineralogy (2001)
Transparent, Translucent
1.5 Refractive Index
1.583-1.6141.530-1.543
Agate Opal
1 3.25
1.6 Optic Character
Not Available
Uniaxial/-
1.7 Crystal System
Orthorhombic Pyramidal H-M Symbol (mm2) Space Group: Ccm21
tetragonal
1.8 Birefringence
Not Available0.000-0.003
Achroite
0 0.296
1.9 Clarity
TransparentAnthony et al
Transparent

Bertrandite and Apophyllite Optic Character

Bertrandite and Apophyllite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Bertrandite and Apophyllite 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 Apophyllite 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. Apophyllite has Uniaxial/- character.

Bertrandite and Apophyllite Transparency

Similar to their colors, Bertrandite and Apophyllite 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.